Norfin Klondike Heat Boot w/ Thinsulate Liner - Men's Grey 12 45-12. Specifications for Norfin Klondike Heat Boot w/ Thinsulate Liner - Men's: Manufacturer: Norfin Gender: Male Boot Style: Winter Boot Footwear Type: Winter Boots Fabric/Material: Thinsulate Footwear Closure: Pull On Features of Norfin Klondike Heat Boot w/ Thinsulate Liner - Men's Inner Thinsulate layer provides thermal insulation and moisture wicking capabilities Heat reflective foil deflects cold and keeps body heat External polyester layer provides premium insulation and moisture management Heated liners feature battery powered heated insoles Power bank requirements: 2 pcs 5V of 2.1aH or more Supplied without batteries Package Contents: Norfin Klondike Heat Boot w/ Thinsulate Liner - Men's Norfin 14777- 45-12: Klondike Heat Boot w/ Thinsulate Liner - Men's Grey 12