Baffin - Hawk (Black) - Men's: Waterproof, seam sealed construction makes this an excellent boot for all types of outdoor activities. Pro-Tech microfibre and 1000 denier nylon upper for durability. Removable inner boot and moisture management system results in an excellent balance of thermal insulation, arch support, impact absorption and stability. Double buckle system for secure fit. Reflective piping for safety. Wind-cutter tongue for added warmth. Temperature rated: -40 C/-40 F. Shaft: 8.5". Circumference: 17".