Sidi Physis Mountain Clipless Shoes – Mens Ice White/Anthracite 45. The shoe for unlimited adventures Physis is designed to deliver all the freedom to top performance. The total carbon stiffness 11 sole with gripping rubber inserts meets Ergofeel anatomic design to preserve the foots natural functionality. Matched by a premium welded upper the shoes deliver the greatest balance of comfort and lightness so that fatigue comes at last. The foot is solidly stabilized with Solid-Strap a technology that Sidi patented to eliminate straps tension loss during performances. With all its features Physis is ready to perform at the top in every ride.