With an MS2 Bobbed, moulded outsole for an aggressive tread pattern the Derwent II offers quality, functionality and comfort in one product. 4mm CR Flex-foam PK Mesh Lining Comfort topline Reinforced toe and ankle Rubber outsole with aggressive tread pattern Temp rating 0C to 18C CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing Material Composition: Other Materials/Other Materials/Other Materials/Other Materials Upper Outer Material: Rubber/Neoprene Lining Material: PK Mesh Sole Material: Rubber Heel Type: Reinforced Fitting: Standard Calf Width: Standard Fastening: Slip on Waterproof: Yes