This warm boot has kept hunters toasty for nearly a decade with a 5mm CR Flex-Foam fleece liner with the added 2mm thermal foam under foot. It's proven combination at frigid temperatures embraced by hunters on the stand and in the blind. Features: Warm fleece lining, 2mm thermal foam under the footbed, 5mm CR flex-foam, EVA contoured molded midsole, MS-1 molded outsole, comfort topline. Material: Rubber, Fleece.