Muck Boots Muck Boot Muck Muckmaster Hi Wellie Material Content: Rubber/Neoprene, Breathable Airmesh, Rubber Washing Instructions: Wipe Clean Lining: Other Materials Material: Other Materials Sole: Other Materials Upper: Other Materials Breathable Airmesh Lining Calf-High Extended Rubber Overlay 2mm Thermal Foam Under the Foot Bed 5mm CR Flex-Foam EVA Contoured Molded Midsole MS-1 Molded Outsole Comfort Topline CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing