Keep extreme conditions at bay with the Sorel® Alpha Pac™ XT boot protecting you all day long.Waterproof PU-backed synthetic textile upper.Polar Lite shell for enhanced flexibility in extreme temperatures.Reflective safety graphics keep you visible in low lighting. Features a built in gaiter with barrel lock closure system for a secure fit.Shatter-resistant YKK Shokonloc buckle closure at collar.Removable 9mm recycled felt inner boot with Omni-Heat™ reflective lining provides superior protection against the cold.Cushioned 9 mm felt footbed provides all-day comfort.Molded EVA midsole offers enhanced comfort, a lightweight feel and thermal protection. 2.5 mm bonded felt frost plug offers a little extra warmth and protection in the midsole.Durable rubber outsole with multidirectional rubber lug pattern for excellent traction.