The SIDI Mens T3 Air Composite White Silver siDi Heel Cup The reinforced heel keeps the foot in a optimal position and avoids the shoe being deformed by extreme performance or prolonged pressure. Replaceable Heel Pad For walkability, SiDi cycling shoes include a replaceable polyurethane heel pad. Eleven Carbon Composite Sole Eleven Carbon Composite Sole is made with two different materials blended together, nylon and carbon fibre. It is made out of injected Carbon Fiber in a matrix of Nylon. The Nylon used doesn’t absorb water and doesn’t lose rigidity in hot or humid weather or as it ages. The result is a significantly lighter and stiffer sole.
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