Sorel's warmest boot. Built for extreme cold, this tall nylon boot features a removable ThermoPlus liner and extra underfoot insulation. With an active warmth rating of -100° F / -73° C you can brave the elements with confidence. Perfect for snowmobiling, ice fishing, or building snowforts with the kids in especially cold conditions.Read more
ThermoPlus Felt Inner Boots
Pioneered by Sorel in 1993 after extensive field testing. ThermoPlus InnerBoots provide superb warmth, moisture transfer, comfort, and durability. An advanced four-layer construction wicks perspiration from the foot, maximizes thermal insulation, and reflects body heat back to the foot for a warm, dry foot `climate`.