This step-in crampon-compatible, low volume plastic boot is designed for all weather mountaineering, glacier and expedition use * Removable inner boot with loden wool lining , climate-control footbed * Tough, impact-resistant polyurethane plastic shell with watertight bellows tongue and protective rubber rand * Shock-absorbing polyurethane midsole, rigid Vibram Alpine sole unit and watertight tongue system * Insole insulated with Thinsulate