Kenetrek Unisex 10" Northern Insulated Boot 100% Leather Rubber sole Handmade vulcanized rubber bottoms for increased durability Removable insulating liner with 400 gr of Thinsulate insulation together with 3 mm of wool felt for warmth without the bulk High traction Kenetrek K-Talon outsole provides serious grip in mud snow or dry ground Extra insulation sealed inside the rubber bottom includes 600 grams of Thinsulate and 9 mm of wool felt