In situations where you sit or stand still for long periodslike ice fishing, hunting, or snowmobilingyour body doesnt generate heat the same way it does when walking or skiing. On top of that, the calf muscles' venous valves, which help keep toes warm during movement, arent active when youre sitting still. Thats when you need seriously heavy-duty winter boots! The high, 1000 denier Nylon shaft, 100% waterproof rubber lower and detachable 8 mm thick liner - these boots are made for proper winter conditions! Kamik is a true expert in winter footwear, and this model is made for the most intense frost, and use where you don't generate a lot of heat by moving. - The shaft is waterproof Nylon with sealed seams - Adjustable cuff - Zylex liner: 8 mm thick, with great insulation - Shaft height: 38.5 cm - Weight 900g/pcs - The lower is synthetic rubber - Snowbob outer sole - Made in Canada