Design: Waterproof DriDefense membrane nylon upper prevents any snow or water from getting in your shoe Waterproof gusset tongue Lace up style In-Shoe Comfort: Odor-eliminating, natural and non-toxic Cleansport NXT(TM) treatment Removable, molded EVA footbed for cushioning and comfort Moisture wicking faux shearling lining Fixed foam and fleece insulation Durability and Traction: ROMMY synthetic rubber outsole Vibram(R) Arctic Grip A.T. wet ice technology Tread designed to syphon water to prevent hydroplaning when cold Additional Details: Vegan-friendly Height: 5.5 inches Weight: 1.6 lbs per pair Circumference (based on size 7): 10 ? inches -22degF comfort rating