Kenetrek Unisex 13 Inch Northern Insulated Boot 100% Leather Rubber sole Super thick 6 ounce oil tanned leather uppers are contoured to fit your leg precisely for incredible support and comfort Snut-Fit lacing system with stud hooks and Power D-Ring lace anchors for the ultimate in ankle support Removable 6 mm thick three part liner quilted from a wicking durable synthetic, 400 gram Thinsulate Ultra Insulation and 3mm of wool felt, plus an additional 600 gram Thinsulate in the rubber bottom and finally 9mm of wool felt underfoot Hand-made rubber outsoles are vulcanized for durability and feature steel shanks with double thick midsoles Custom Kenetrek K-Talon Outsole design has a deep and open tread design for serious grip and traction