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The Sidi Ergo 4 Carbon Shoes are proof that Sidi continues to make their great shoes even better. The Microfiber TechPro upper provides stability, lightness, and durability in a non-binding comfortable fit. The Techno 3 Buckle System allows easy on-bike fit adjustment, while Soft Instep Closure System and padded tongue eliminate pressure points. Adjustable Heel Security System prevents power robbing heel lift, while the ventilated Microfiber upper delivers cool comfort. The Ergo 4 features replaceable non-slip rubber heel tabs for secure walking and the Twelve Carbon Composite sole is made with two different materials blended together, nylon and carbon fiber, that doesn't absorb water and maintains rigidity in hot or humid weather or as it ages. The result is a significantly lighter and stiffer sole.