If these Boots keep out the cold even when it's -60°F, imagine how well they'll perform the rest of the winter. The 8mm CR Flex-Foam comfortably moves with you while working as insulation to keep you warm. Plus, there's an extra 2mm of thermal foam under the insole. That's perfect for comfort during ice fishing days or traversing the frozen tundra. • 8mm CR Flex-Foam, additional 2mm thermal foam underfoot combine for total warmth • Bob-Tracker molded outsole digs in for top traction • Stretch-fit topline fits to calf to keep cold out and warmth in • Warm fleece lining • EVA contoured-molded midsole • Comfort range of -60°F to 40°F These are an Amazon return and have slight scuffing on the bottom of the boot. Internal ID #7