The warmest boot we make, the Extreme is unbeatable for snowy and extreme cold conditions. The hand-laid vulcanized rubber bottom features 600g of Thinsulate™ Ultra Insulation for extreme warmth around your foot. Together with the included removable 400g Thinsulate™ liner, the Extreme has a total of 1000g of total insulation. We import only the world's finest hand-laid vulcanized bottoms for unsurpassed strength, durability and comfort. The Advantage™ outsole provides excellent traction over all terrain. If you're traveling to the Arctic Circle, ice fishing in sub-zero temps, or just sick of cold feet in the tree stand, this is the boot for you. Exclusive Goodyear™ Advantage™ outsole6oz oil tanned top grain leather100% milled brass hardwareRemovable 400g liner600g insulation built into rubber bottomComfort rated -20°F Inactive to -40°F ActiveRebuildable Schnee's Extreme Brown PAC BOOT 10" SH-EXTOS-10, 5