Baffin - Bison (Black) - Men's: 1000 denier nylon upper. Tech-tie lacing system for a secure fit. Snow collar for deep powder protection. -40 C/-40 F temperature rated. Removable inner boot. High density EVA platform. Removable 6mm EVE contoured footbed. Rugged, lightweight rubber base and wide-track outsole. Shaft: 11.5". Circumference: 20".