The Muck Arctic Sport High Boot is light weight (2-2.5 pounds per boot) and has a comfort range of 60° F to -40°. The stretch-fit top binding fits snug to the calf keeping warmth in and the cold out. The Muck Arctic Sport High Boot also features double reinforced instep, heel and Achilles area, 2 mm thermal foam underlay on instep area for additional warmth. The EVA molded midsole has a contoured footbed and a reinforced toe adds protection with a wrap-up bumper.