The cure for absolute fridged weather, the 10" NORTHERN boot gives you the snug fit and comfort of a walking boot with all day support and total warmth. Comfort rated to -20 degrees thanks to the quilted three layer removable liner with 400 grams of Thinsulate Ultra Insulation and 3mm of wool felt. An addtional 600 grams of Thinsulate Ultra Insulation and 9mm of wool felt are sealed inside the rubber bottom for maximum warmth. K-Talon outsoles provide sure grip in icy conditions. The 10" NORTHERN is a true below zero boot that is still comfortable to walk in. We assemble these boots in Bozeman, Montana with the finest components available imported from several countries. Men's whole sizes (5-15) medium width.Half sizes round up to the next whole size, women order 1-1 1/2 sizes smaller. 5.8lbs. Made in Thailand.