Sidi T4 Air Carbon Composite Tri Shoe Women's: The T4 Air Carbon Composite features a super-perforated triathlon-specific upper for maximum drainage and ventilation, with a plush, brushed interior for sock-free comfort for fast transitions and supreme comfort on the bike leg. A large pull-tab on the heel and the two wide hook and loop fastener straps, placed mirror-inverted, help to change shoes on the fly.
TWELVE CARBON COMPOSITE sole is made with two different materials blended together, nylon and carbon fiber. 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.