You"re at the top of your game at the top of the world in the Baffin Apex boot, part of the Baffin Polar Series. This men"s extreme cold-weather boot has a waterproof upper constructed from Timberwolf Leather and insulated nylon with an integrated Arctic Flex rubber foot. The sturdy front lace closure lets you adjust for the perfectly snug fit, keeping out Arctic air. Inside, Baffin"s signature eight-layer inner boot system is engineered to keep your toes warm, dry and protected down to -148 degrees. Delivering a secure foundation, the Baffin Apex mid-calf expedition boot is finished with a polar rubber traction outsole that won"t crack in the cold.