The Arctic Sport Steel Toe features stretch-fit topline binding that fits snug to the leg to keep warmth in and cold out. This 5mm CR flex-foam bootie has four-way stretch nylon, 100% waterproof, lightweight and flexible. The MS-1 molded outsole is rugged, aggressive and durable for maximum protection and stability. There’s double reinforcements on the instep, heel and achilles areas. There’s also an EVA molded midsole with contoured footbed, reinforced toe, and added toe protection with a wrap-up bumper.