Designed for long distance trail training and ultra racing, the Spin Infinity has a dual-density EVA midsole, featuring a low density base that provides plentiful cushioning and impact absorption, and on top of that is our Foot Stabilizer Control system (FSC). Breathable mesh with overlays of thermally welded PU film for additional protection, support and abrasion resistance. SOCK-FIT LW: Stretch fabric incorporated with a minimal stretch tongue provides gentle wrapping and support, reducing bulk and enhancing fit. Low profile stretch pocket for stowing laces after tying. Dual-density compression molded EVA with our Foot Stabilizer Control System in medium density for stability and torsion control and a low density base for max cushioning. Vibram outsole with Megagrip rubber compound for increased traction and friction. DROP : 4mm CUSHION : High OUTSOLE : Vibram Velox Cross/ Megagrip UPPER : Mesh & PU Film & Micro Nubuck UNDERFOOT PROTECTION : Moderate WEIGHT: 260g (1/2 pair, size 38)