Hard shell mountaineering boot, with Duratherm insulation, for the most demanding glacier climbing and expedition use * Removable inner boot liner with waterproof GORE-TEX Duratherm and Scotch 3M Thinsulate and with additional Thinsulate in the insole provides added warmth * Polyurethane shell upper, crampon compatible * Shock-absorbing polyurethane midsole, rigid Vibram Alpine sole unit and watertight tongue system * Additional Thinsulate in the insole provides added warmth