Physis is designed to deliver all the freedom to top performance. The total carbon high-stiffness sole with gripping rubber inserts meets an Ergofeel anatomic design to preserve the foot's natural functionality. Matched by a premium welded upper, the shoes deliver the greatest balance of comfort and lightness. The foot is solidly stabilized with Solid-Strap, a technology that Sidi patented to eliminate strap tension loss during performances. With all its features, Phisys is ready to perform. -Premium welded dual-layer construction is lighter but solid -Integrated impact protectors provide protection without any burden on the toes, heel, or side of the foot -Seamless heel counter stabilizes the foot for a safe and comfortable ride -High visibility inserts enhance safety -Unum ergo anatomical tongue adapts to the foot for greater comfort while in motion -Millenium fit technology combines comfort and stabilization -Dial system with strap closure allows for individualized adjustments that do not lose tension -XC2FC full carbon sole with cushioning grip areas are designed for maximum power transfer -Rubber compound structure with crampons keep you in control -Ergo-feel sole design maintains the foot's natural shape