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The Sidi Kaos Carbon Shoes are engineered for the high-performance, high-mileage cyclist who requires a rigid shoe that does not compromise the foot's blood circulation, guaranteeing comfort and great power transfer. The shoe employs Sidi's Millennium 4 Carbon Composite sole, injected carbon fiber in a matrix of Nylon, providing more rigidity than a standard nylon sole. The sole is also more durable, completely non water-absorbent and mechanically stable, meaning it's less susceptible to changes in stiffness resulting from aging, prolonged usage, and changes in temperature or humidity. Tecno 3 Buckle System and Caliper buckle allow easy on-bike fit adjustment, while the Soft Instep 2 Closure System and padded tongue eliminate pressure points. The reinforced heel cup prevents power robbing heel lift and the ventilated synthetic upper delivers cool comfort. Replaceable non-slip rubber heel pad.