The shoe for unlimited adventures The Sidi Men’s Physis is designed to deliver top performance. The total carbon stiffness 11 sole with gripping rubber inserts meets Ergofeel anatomical sole 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 Tension-Strap a technology that Sidi patented to eliminate straps’ tension loss during during.