Lowa Men's Civetta Mountaineering Boot 100% Plastic 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