Muck Boots Muck Boot Muck M’s Muckster Ii Ankle Wellie Material Content: Rubber/Neoprene, Breathable Airmesh, Rubber Washing Instructions: Wipe Clean Lining: Textile Material: Other Materials Sole: Other Materials Upper: Other Materials 4mm CR flex-foam Breathable, Airmesh lining Comfort Topline Pull-On Tab New Technical, High Traction, Rubber Outsole CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing