A highly technical and warm four season boot, the Phantom Tech excels at ice climbing while staying lightweight on your feet. The boot uses a warm Primaloft Silver liner wrapped in an integrated HDry waterproof gaiter to stay warm and dry pitch after pitch, as well as a Carbon Fiber and Aerogel insole to keep cold creep at bay. The cutting edge of ice climbing boot technology. Tech Specs: SIZE OPTIONS : 38 - 47 (half sizes); 48 (whole size) WEIGHT REFERENCE : 730g; 1lb 9.6oz (1/2 pair size 42) UPPER : PU Tek & S-Tech Fabric with HDry waterproof direct lamination membrane LINING : Primaloft Silver MIDSOLE : 2D PU OUTSOLE : Vibram Precision Tech Roll / Mont INSOLE : Carbon Fiber + EVA + Aerogel INSULATION : Yes PRIMARY MATERIAL : Synthetic CRAMPON COMPATIBILITY : Automatic, Semi-Automatic WATERPROOF-BREATHABLE : Yes