The boots have been in the line for nearly a decade and has proved its comfortable warmth throughout the northern reaches of the world. 5mm CR Flex-Foam Warm fleece lining 2mm Thermal foam under the footbed EVA contoured molded midsole MS-1 molded outsole Comfort topline Material Composition: Other Materials/Other Materials/Other Materials/Other Materials Upper Outer Material: Rubber/Neoprene Lining Material: Polyester fleece Sole Material: Rubber Heel Type: Normal Fitting: Standard Calf Width: Standard Fastening: Slip on Waterproof: Yes