Rugged and durable, this waterproof boot features a built in gaiter, molded EVA comfort footbed, multidirectional rubber lug outsole, and Thinsulate Ultra insulation to ensure that feet stay secure, warm, dry and protected during demanding activities in extremely cold winter weather.. . . . Sorel comfort rated to 40AdegFC for extreme warmth. 400 g Thinsulate Ultra insulation for excellent warmth without bulk. Rubber outsole with multidirectional lugs for enhanced traction. EVA midsole inserts for cushioning and support. Seam sealed waterproof construction to keep feet dry. Waterproof full grain leather and synthetic textile upper. Injection molded waterproof thermal rubber shell keeps feet dry. Built in gaiter with barrel lock closure system. Achilles adjustment strap with shatter resistant YKK Shokonlock buckle closure. Removable molded EVA footbed for added cushion and support. Shaft height: 8 12 in. 23 cm. Calf circumference: 15 in..