The Sidi Wire 2S Road Shoes are engineered specifically for athletes who seek maximum foot stability when unleashing extreme power. Ventilated carbon sole with innovative Firmor Closure 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 stability. -The Single Tecno-3 system creates a perfect tension balance between the shoe's internal and external side, and guarantees an excellent closure adapting to every instep -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 -Oval holes extend the adjustment position of the cleat by +- 5 mm and a millimeter scale is included for determine the riders personal cleat position -For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad. Wire's heel pad has a new design and it is very light -The Vent Carbon Sole is designed with an integrated vent and air channels for heat dissipation and air flow. The vent can be opened or closed for 4-season comfort