With 8mm of CR Foam fleece lining wrapped in our soft rubber outer layer your feet will stay warm and dry in most extreme temperatures. And since the outsole features Vibram Arctic Grip compound, you can rest easy walking on the iciest of pathways. 8mm CR Flex-Foam Warm Fleece Lining Extended Rubber Exterior New Midsole Vibram Arctic Grip Outsole Spandura Material Composition: Other/Other/Other Upper Outer Material: Rubber Lining Material: Fleece Sole Material: Vibram Arctic Grip Fitting: Standard Calf Width: Standard Fastening: Pull-on Waterproof: Yes