Designed specifically for cool and wet conditions, Ragnarök provides a high level of water resistance, moisture regulation, and comfort in a performance cycling shoe. Constructed with a BOA closure, waterproof membrane, and rubberized shell that extends above the ankle, Ragnarök delivers unrivaled weather protection in the wettest and muddiest of conditions. - Hook-and-loop neoprene ankle - BOA closure with IP1 low power reel - Works with 2-bolt mountain compatible cleats - Black finish - 25ºF+ / -3ºC+ Comfort

Ragnarök BOA® boots are perfect for the hard-to-predict weather of late fall and early spring. Built to block cold and moisture, these lightweight cycling boots feature a 25ºF+ (-4ºC+) comfort range to keep feet warm and dry through the chill of late autumn and early spring rides. - Free cleat plates for flat-pedal use are available upon request. Please contact brand support at info@45nrth.com - Rated for 25ºF+ (-4ºC+) comfort - Waterproof breathable membrane to manage moisture - Neoprene ankle cuff to keep out moisture and road grit - The BOA® Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions - Real-rubber outsole with added grip for slippery surfaces - 2-bolt cleat mount ANTI-SLIP MICROGLASS RUBBER A rubber compound electrostatically aligned with microscopic glass fibers to create abrasive protruding shards, increasing friction on slippery surfaces such as ice, wet wood, wet linoleum, and wet metal found on many stairs and floors. WATERPROOF-BREATHABLE MEMBRANE An ultra-thin sheet of microporous material behind our textile shells keeps you dry and warm in the harshest weather conditions. Our waterproof, breathable membranes stop liquid from the outside, but release vapor from the inside for thermal and moisture regulation. BOA CLOSURE Micro-adjustable BOA closure for perfectly dialed fit. LOW CUT NEOPRENE ANKLE Secure closure provides warmth and protection from the elements.

Ragnarök Tall is the remedy for cool and wet conditions. Our shoulder-season performance shoe features a waterproof membrane and tall neoprene cuff to regulate moisture and keep out mud and grit. End uncomfortable rides with Ragnarök’s unrivaled weather protection. - A redesigned opening makes Ragnarök easy to put on and take off, and a floating three-finger overflap allows riders to dial in the perfect fit - Ragnarök’s real rubber outsole has an aggressive tread for walking in mud and features a 2-bolt cleat mount - Tall neoprene cuff keeps debris out - Easy on and off - Floating three-finger overflap allows the BOA laces to tighten where they need to for an optimal fit - Imported

Originating from the conceptual standpoint of a mountaineering boot, the new and evolved Wölvhammer is lighter, more comfortable, and grippier. The overhauled design features a removable synthetic liner and a three-piece proprietary bottom assembly compatible with flat and clipless pedals. When the cold winter creeps in, Wölvhammer has you covered. - Removable synthetic liner boot for quick drying - 3-piece proprietary bottom assembly is lighter, warmer offers more walking traction - Aerogel insulation blocks cold cleats and allows use of preferred insoles without sacrificing warmth - 0 to 25F / -18 to -4C Comfort

Most winter boots aren't made for riding bikes — they're too warm in some spots or not warm enough in others, and they're not optimized for pedaling. Wölvhammer BOA® boots are the answer for winter riders. Designed and built for the rigors of real winter riding (deep snow, slippery ice, cold pedals), These winter bike boots are rated for comfort from 0º to 25ºF (-18º to -4ºC), slotting between our Ragnarök and Wølfgar boots. Take on winter rides with Wölvhammer. - Rated for 0º to 25º F / -18º to -4º C comfort - The BOA® Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions - Hook-and-loop upper strap helps secure boot - Removable synthetic liner boot for quick drying - Waterproof breathable membrane to manage moisture - 200 g of Primaloft® insulation - Aerogel insulation underfoot blocks the chill from snow, ice, and cold pedals, and allows for insoles without sacrificing warmth - Non-slip sole for walking on icy surfaces - Compatible with flat and clipless pedals NOTE: The webbing loop on the back of the original liner boot was not stitched properly and will come loose if pulled with too much force. All Wölvhammer BOA shipments will now include free updated liner boots with the loop sewn directly to the vertical seam on the back of the liner for a much stronger connection.

Step into Wølfgar, the world’s most advanced winter cycling boot. We’ve combined decades of winter cycling experience with NASA-grade insulation materials for a boot that keeps feet warm and dry down to -25ºF. Wølfgar is a boot worthy of singletrack sessions or multi-day expeditions in the harshest winter weather. - Our lightweight three-piece proprietary bottom assembly is compatible with both flat pedals and 2-bolt cleats, and features a rubber outsole with microglass lugs for traction on ice - Waterproof materials and construction keep the elements out, while aerogel under the foot and over the toe block frigid air - On the inside, Wølfgar’s reflective thermal lining retains warmth, and a removable wool and faux-fur liner wicks moisture and insulates

Flat pedal mountain bike shoes with an impact resistant toe box. The adidas Five Ten Freerider Pro Primeblue Mountain Bike Shoes match proven flat pedal control with enhanced impact coverage. Recycled materials raise the bar for sustainability. Stealth® rubber and a Dotty tread offer the legendary pedal control you expect from the Freerider family. Their comfortable build lets you move easily from bike to street for everyday versatility. PRIMEBLUE From problem to performance This product is made with Primeblue, a high-performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is textile, 75% of the textile is Primeblue yarn. No virgin polyester. PEDAL-GRIPPING RUBBER Stealth Dotty rubber outsole is size-specific for maximum grip on and off the pedal. IMPACT-RESISTANT TOE BOX Three-layer reinforced toe box adds impact resistance. SPECIFICATIONS - Regular fit - Lace closure - Textile upper - OrthoLite sockliner - Molded EVA midsole - Stealth Dotty rubber outsole - Primeblue - Imported

The Stamp flat shoe does it all, whether on street or trail. The outsole is optimized for Crankbrothers Stamp pedal body, though it is designed to work flawlessly with any flat pedal. Its high-friction rubber compound provides optimal grip and its lug depth absorbs the pins to ensure a secure pedal connection. - Closure System: Classic lace closure system offers smooth closure with round laces and a pocket to safely tuck laces. - Match Compound: Our flat rubber compound (MC2) is optimized for grip and durability. It has high-friction to stick to the pedal body and low rebound properties to dampen vibrations. The lugs are rounded to resist abrasion. - Match Outsole: The tread pattern is designed for traction off the bike. Directionally angled and spaced toe and heel lugs offer traction for hiking up or down steep terrain. The ramped toe provides walkability on steep terrain. - Match System: The tread pattern is designed for maximum contact surface and compatibility with the pedal platform. In addition, the lug depth is designed around pin dimensions to absorb the pin body. Upper Features: - Closure system - Hidden eyelets - Lace pocket - Perforated toe - Mesh windows - Perforated tongue - Reinforced toe - Padded tongue - Heel dots

The Eagle 10 is a great chassis for any day on the dirt track, whatever your riding style. The Microtech upper, the first microfiber introduced in shoes years ago by the brand, offers all the comfort the brand has, while the sole is designed to ensure comfort both on and off the bike. -The Microtech and microfiber plush upper makes for an ultra-comfortable shoe -Sidi heel counter offers all the stabilization and the control without the extra weight -Integrated impact protectors offer protection without any burden on the toes -Dial system plus instep closure system for a customizable fit -The MTB SR17 sole delivers the optimized stiffness for MTB trails -Rubber inserts on the sole provide unbeatable stability on the toughest terrains -Sole inserts are engineered for durability

The Sidi technology used for mountain biking is applied to the gravel discipline with its most technical aspects in a high-performance, rigid shoe with a closure designed for comfort and control. -The Tecno-3 Push System dials in fit along the entire length of the shoe, adapting the upper to the shape of the foot for a customized fit -All new proprietary Sidi Wire material that is completely non-binding for intuitive and effortless on-the-fly adjustments -Like most Sidi small parts, the Tecno-3 System is serviceable and replaceable -The reinforced heel cup stabilizes and supports the heel. Anatomically shaped to reduce heel slip and increase power transfer -The toe box is rubberized to resist and deflect impacts from stones or debris when cycling -The Sidi MTB SR17 sole represents an ideal balance of stiffness for efficient power transfer and flexibility and comfort for walking -The toe inserts are easily replaceable and offer the possibility to mount spike for particularly muddy rides

The Sidi Fast 2 features a minimalist look with a focus on rigidity, softness, and flexibility. This fast and efficient shoe with tested strength and grip is built for the most demanding rides. Easy adjustment and a clean design offer convenience so you can get out and ride. -Premium microfiber material is plush and comfortable with anatomical heel construction -Anatomical heel construction provides more stability for the heel -High-density resin dialing system with Dyneema for a personalized fit -Aerolite carbon plus nylon sole with a stiffness level of 5 combines ergonomics with power transfer -Sole inserts are engineered for durability

Designed for our professional athletes, the Sidi Tiger 2S efficiently transfers all the power you can unleash while maintaining a high level of comfort, allowing you to focus entirely on the course. The Tecno 3 closure is strategically placed to prevent contact with other riders in crowded situations. The upper is made of Bioveg material derived from recycled microfibers with a plant based external finish. The MTB SRS Carbon sole harnesses the strength of interwoven carbon fibers for efficient energy transfer and its SRS technology allows riders to maintain maximum grip level at all times. -The Tecno-3 Push Flex completely eliminates the pressure zone on the instep and significantly improves the comfort of the closure -Like most Sidi small parts, the Tecno-3 System is serviceable and replaceable -The adjustable heel retention device reinforces the top of the heel cup, closing the back of the shoe securely so the heel doesn't slide out during steep climbs or sprints -The all new Sidi Integrated Heel Cup is light, comfortable and reinforced to avoid deformation -Each side of the heel can be adjusted independently for a perfect fit -The upper part of the toe section is protected with anti-slip rubber to resist and deflect impacts from stones or debris when cycling -The MTB SRS Carbon-Ground Sole raises the standard for mountain bike performance, dropping around 100 grams per pair compared to the previous Dragon Carbon SRS sole without sacrificing power or durability -The MTB SRS Carbon-Ground Sole consists of replaceable tread blocks in the toe and heel attached to a medium-modulus carbon sole -The Ground SRS treads and MTB Plate are easily removable and replaceable and the sole is toe-spike compatible -To improve walkability, Sidi cycling shoes include a replaceable polyurethane heel pad

Engineered specifically for athletes who seek maximum foot stability when unleashing extreme power. Ventilated carbon sole with innovative Firmor lateral support system suitable for athletes who need to combine power transfer with greater lateral foot stability. The specially designed dual-rotor closure offers the ultimate adjustment for the perfect level of lateral support. -Made with high-grade Microtech microfiber to enhance foot stability -Adjustable heel retention allows for a bespoke fit -Firmor later support provides added stability -Dual dial system with Dyneema cables allows for precision fitting -The vent carbon sole has a high stiffness level, creating a maximum power exchange on the pedals

Sidi Ergo 6 is the ultimate road cycling shoe. With Firmor lateral technology, the foot is stabilized even during the most intense performances, delivering a feeling of total control. The shoes are engineered to adapt to the foot with its Unum ergonomic shape upper for a premium comfort feeling. A full carbon sole, with a stiffness level of 11, it features an increased range of cleat adaptability with 75mm connection sections for personalized fitting. -Premium perfection upper with engineered ventilation and integrated bumpers -Seamless heel counter provides stabilization and control without the extra weight -Integrated Firmor lateral structures provide impact protection where needed -Millenium Fit technology combines comfort and stabilization -Dials system connected to Firmor contours the whole foot for a personalized fit -Unum Ergo Anatomical Tongue adapts to the foot for greater comfort with every motion -R2FC full carbon sole with stiffness a high stiffness level of 11 is light, aerodynamic, ergonomic and designed to transfer power -Individual pedal positioning features a 75mm plate with 15mm extension to find the perfect spot

Enhance your gravel riding with Asper, designed for every trail adventure. Velcro straps ensure quick closure and a perfect fit for a smooth pedal stroke. The new fit provides exceptional comfort, and the durable, scratch-resistant upper withstands tough rides. With a stiffness of 5, the sole allows natural foot movement and comfortable walking on mixed terrain, while offering optimal grip for pedal stability. -Structured microfiber upper is comfortable and durable -Integrated impact protectors on toes, heel, and side to keep you protected in any terrain -The Unum Ergo Feel anatomical upper is designed to be one with the foot -Seamless heel counter stabilizes the foot for a safe and comfortable ride -Millenium fit technology combines comfort and stabilization -Stable closure strap maintains a stable fit -A nylon plus glass fiber sole has a minimal stiffness level to keep you comfortable while riding and throughout the day -Features inserts designed to provide traction -The Ergo-feel sole design maintains the foot's natural shape in every motion

A fast and efficient shoe with tested strength and grip for the most demanding rides. Intuitive adjustments and a clean design make the Sidi Fast 2 an easy-to-use high-performance shoe. -The Single Tecno-3 system creates a perfect tension balance between the shoe's internal and external side, guarantees an excellent closure adapting to every instep -The newly designed integrated heel cup is lightweight and reinforced to avoid deformations after prolonged strenuous use -The Aerolite sole is designed to maximize aerodynamics and power transmission -The nylon and carbon fiber construction of the Aerolite Sole provides the ideal balance of stiffness for efficient power transfer, and flexibility for comfort -The Fast 2 includes a user replaceable polyurethane heel pad for improved stability and traction off the bike

Whatever the journey, Sidi Aertis is there to make it easier and better. The comfort of a premium suede construction meets Firmor Closure technology to offer great lateral support. The nylon sole with replaceable rubber insert allows for maximum grip in any situation and increased walking comfort. -Designed for maximum lateral support the Firmor Closure contours the foot with a solid hold, and allows infinite size adjustment for the ideal individual fit -Sidi's Tecno-3 System dials in fit along the entire length of the shoe, adapting the upper to the shape of the foot for a customized fit -The closure uses a new proprietary Sidi Wire monofilament that is completely non-binding for intuitive and effortless on-the-fly adjustments -Like most Sidi small parts, the Tecno-3 System is serviceable and replaceable -The Sidi MTB SR17 sole represents the ultimate result in terms of stiffness for pedaling and flexibility for walking -The toe inserts are easily replaceable and offer the possibility to mount spikes for particularly muddy rides

The Sidi Prima is designed for the modern rider. The Prima is easy to wear and adjust, thanks to its Firmor Closure and lightweight upper built to reduce foot fatigue. Its low-profile carbon nylon Aerolite Sole is engineered for efficient power transfer for sprinting, with enough flex and comfort for long rides. -The Single Tecno-3 System creates a perfect balance between the shoe's internal and external side, providing an excellent fit while adapting to every instep -The newly designed integrated heel cup is lightweight and reinforced to avoid deformations after prolonged strenuous use -The Aerolite sole is designed to maximize aerodynamics and power transmission on the bike -The nylon and carbon fiber composite material of the Aerolite Sole provides the perfect balance of stiffness and flex for efficient and comfortable pedaling -Sidi cycling shoes include a replaceable polyurethane heel pad designed for good walkability

Whatever the journey, Aertis is there to make it easier and better. The comfort of a premium suede construction meets the Firmor Closure technology to offer great lateral support. The nylon sole with replaceable rubber insert allows for maximum grip in any situation and increased walking comfort. -Designed for maximum lateral support the Firmor Closure contours the foot with a solid hold, and allows infinite size adjustment for the ideal individual fit -The Sidi Mega Last provides Sidi fit and performance to riders who have slightly wider feet -The Sidi Mega Last is 4mm wider across the ball of the foot, has more volume, a higher instep and a wider heel cup -Mega lasts are sized EE to EEE -Sidi's Tecno-3 System dials in fit along the entire length of the shoe, adapting the upper to the shape of the foot for a customized fit -The closure uses a new proprietary SIDI Wire monofilament that is completely non-binding for intuitive and effortless on-the-fly adjustments -Like most Sidi small parts, the Tecno-3 System is serviceable and replaceable -The Sidi MTB SR17 sole represents the ultimate result in terms of stiffness for pedaling and flexibility for walking -The toe inserts are easily replaceable and offer the possibility to mount spikes for particularly muddy rides

The Sidi Prima is designed for the modern rider. The Prima is easy to wear and adjust, thanks to its Firmor Closure and lightweight upper built to reduce foot fatigue. Its low-profile carbon nylon Aerolite Sole is engineered for efficient power transfer for sprinting, with enough flex and comfort for long rides. -The Single Tecno-3 System creates a perfect balance between the shoe's internal and external side, providing an excellent fit while adapting to every instep -The Sidi Mega Last provides Sidi fit and performance to riders who have slightly wider feet -The Sidi Mega Last is 4mm wider across the ball of the foot, has more volume, a higher instep and a wider heel cup -Mega lasts are sized EE to EEE -The newly designed integrated heel cup is light weight and reinforced to avoid deformations after prolonged strenuous use -Aerolite sole is designed to maximize aerodynamics and power transmission on the bike -The nylon and carbon fiber composite material of the Aerolite Sole provides the perfect balance of stiffness and flex for effortless and comfortable pedaling -For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad

Whatever the journey, the Sidi Aertis is there to make it easier and better. The comfort of a premium suede construction meets the Firmor Closure technology to offer great lateral support. The nylon sole with replaceable rubber insert allows for maximum grip in any situation and increased walking comfort. -Designed for maximum lateral support The Firmor Closure contours the foot with a solid hold, and allows infinite size adjustment for the ideal individual fit -Sidi's Tecno-3 System dials in fit along the entire length of the shoe, adapting the upper to the shape of the foot for a customized fit -The closure uses a new proprietary Sidi Wire monofilament that is completely non-binding for intuitive and effortless on-the-fly adjustments -Like most Sidi small parts, the Tecno-3 System is serviceable and replaceable -The Sidi MTB SR17 sole represents the ultimate result in terms of stiffness for pedaling and flexibility for walking -The toe inserts are easily replaceable and offer the possibility to mount spikes for particularly muddy rides -The women's specific fit is narrower across the ball of the foot and features less volume inn the instep area and a narrower heel cup

A minimalist look for a concentrate of rigidity, softness, and flexibility. The fast and efficient shoe with tested strength and grip for the most demanding actions. Easy adjustment and a clean design make it even easier and more immediate to use. Developed in partnership with Sartoria Ciclistica, these shoes embody the spirit of cycling as a recreative activity, perfectly paired with a cup of coffee. -Anatomical heel construction is contoured for better stability -Dyneema dialing system is crafted from high-density resin for a customizable fit -Aerolite carbon plus nylon with sole with a stiffness level of optimized for ergonomics with power transfer -Sole inserts engineered for durability

Experience the pinnacle of performance with the new Gore-Tex EPE Membrane with Ripstop, offering water resistance, scratch protection, and a flexible fit. Anatomical heel construction and Millennium Fit deliver all the stabilization and control without extra weight, ensuring superior comfort for everyone. The Quicklace closure enhances safety and speed, while the X2NC sole with stiffness 5 and grip sole inserts provide unparalleled control and comfort. Reinforced toes and heels ensure lasting durability, making it unmistakably Sidi. -Gore-Tex EPE membrane is environmentally friendly and 100% PFC-free -Outer features ripstop material to keep water out with a flexible fit -Reflective inserts shine at night for safer cycling -Quicklace closure is easy to use and is pressure-free -Winter-proof design to maintain thermal balance -X2NC sole allows you to keep a great level of control -Designed for durability with a protected toe design

Physis is designed to deliver all the freedom to top performance. The total carbon high-stiffness sole with gripping rubber inserts meets an Ergofeel anatomic design to preserve the foot's natural functionality. Matched by a premium welded upper, the shoes deliver the greatest balance of comfort and lightness. The foot is solidly stabilized with Solid-Strap, a technology that Sidi patented to eliminate strap tension loss during performances. With all its features, Phisys is ready to perform. -Premium welded dual-layer construction is lighter but solid -Integrated impact protectors provide protection without any burden on the toes, heel, or side of the foot -Seamless heel counter stabilizes the foot for a safe and comfortable ride -High visibility inserts enhance safety -Unum ergo anatomical tongue adapts to the foot for greater comfort while in motion -Millenium fit technology combines comfort and stabilization -Dial system with strap closure allows for individualized adjustments that do not lose tension -XC2FC full carbon sole with cushioning grip areas are designed for maximum power transfer -Rubber compound structure with crampons keep you in control -Ergo-feel sole design maintains the foot's natural shape

Experience ultimate cold-weather protection with PrimaLoft insulation, ensuring warmth without extra weight. Enjoy all the stabilization and control with anatomical heel construction and Millennium Fit, designed for both sneakerheads and casual wearers. The YKK Zip closure provides reliable and smooth operation, while the X2NC sole with stiffness 7 and grip sole insert deliver peak performance and enhanced control. Reinforced toes and heels guarantee durability, making it unmistakably Sidi. -PrimaLoft insulation for ultimate cold weather protection -Quicklace system for pressure-free and fast closure -YKK zip closure delivers reliable and smooth operation -Reflective inserts shine at night for safety -Winter-proof design to maintain thermal balance -X2NC Sole for peak performance and stability -Designed for durability with a protected toe design

Atomus excels on technical trails with its in-house developed Materiis sole compound, inspired by Sidi's 60 years of experience in controlling the most demanding environments like motocross. Built to withstand tough terrain and perform in any condition, Atomus meets the extreme demands of motocross, ensuring durability during jumps, braking, and all-terrain maneuvers. With reinforced toe protection and a durable tread, Atomus delivers unmatched performance and reliability. - Ripstop fabric construction, premium materials designed for the most technical trails - Structured ventilation engineered to cool the body and maintain performance - Impact absorption sole structure for jump landing performance - Firmor lateral support technology stabilized in every trail

The known comfort of Genius meets a knitted hyper-vented nylon construction. Designed to maintain its shape and structure, the foot is well-stabilized during rides while staying fresh on the warmest days. A carbon/nylon composite sole stiffness 6, Sidi's unique instep closure, and Dyneema high density dials complete the model for a comfortable premium ride experience. -Premium dual layer instruction features one layer for ventilation and a second for durability for a shoe that is both fresh and resistant feeling on the bike -Engineered ventilated upper allows for direct airflow to the foot for greater cooling -Sidi heel counter keeps the foot stabilized -Dyneema dialing system is crafted from high density resin -The carbon composite sole features a stiffness level of 6, combining performance and greater comfort -Sole inserts engineered for durability

The iconic design that gave birth to our first cycling shoes over 60 years ago meets modern materials to create our lightest racing shoes. Designed to retain all support and strength, the Sidi Sixty offers the ultimate fit in a pair of racing shoes for cycling. -The Sidi Tecno-4 Push System has a single rotor to reduce the shoe's weight and guarantees the precision of a micro-metric closure -The Adjustable Heel Retention device reinforces the top of the heel cup and improves the fit by closing the back of the shoe securely around the rider's heel -The heel retention device tightens the top of the heel cup so that the heel is secured during steep climbs and sprints, each side of the heel can be adjusted independently for a perfect fit -The Vent Carbon Sole is handmade exclusively of carbon fiber in a weave pattern oriented at opposing angles that maximize stiffness while allowing for a small degree of controlled flex in the toe area -The Vent Carbon Sole features a standard 3-hole drilling pattern, printed 10 mm lateral and fore/aft cleat alignment scale for easy cleat alignment and replacement -The key benefits of the Vent Carbon Sole are not only superior power transfer because of its light weight and stiffness, but also warm weather comfort -For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad

The Sidi T-5 Air is designed specifically for triathlon. The upper weathers rain and water without losing stiffness, and the closure system is easy to adjust and reliable, the T-5 Air is particularly suitable for giving your best during triathlon competitions. -The highly secure hook-and-loop closure is simple but reliable, easy to adjust and fine tune, especially on the bike -The newly designed integrated heel cup is lightweight and reinforced to avoid deformations during strenuous rides -The Carbon Composite Sole 20 is composed of nylon and injected carbon fiber. The result is a light and rigid sole, which does not lose its characteristics when climatic conditions change or with the passage of time -The central part of the sole is graduated with milli-metric scale for precise cleat position and fine tuning -For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad

The Sidi Prima is designed for the modern rider. The Prima is easy to wear and adjust, thanks to its Firmor Closure and lightweight upper built to reduce foot fatigue. Its low-profile carbon nylon Aerolite Sole is engineered for efficient power transfer for sprinting, with enough flex and comfort for long rides. -The Single Tecno-3 System creates a perfect balance between the shoe's internal and external side, providing an excellent fit while adapting to every instep -The newly designed integrated heel cup is light weight and reinforced to avoid deformations after prolonged strenuous use -The Aerolite sole is designed to maximize aerodynamics and power transmission on the bike -The nylon and Carbon fiber Composite material of The Aerolite sole provides The perfect balance of stiffness and flex for efficient and comfortable pedaling -Sidi cycling shoes include a replaceable polyurethane heel pad designed for good walkability -The women's specific fit is narrower across the ball of the foot and features less volume inn the instep area and a narrower heel cup