The Muckmaster is a trusted classic, perfect for farmers and outdoor workers. Its durable design features a calf-high rubber overlay and waterproof airmesh lining. With 2mm thermal foam and a molded midsole, these boots provide superior warmth and comfort, while the CR flex-foam adjusts to your foot for a secure fit. Made with quality rubber and airmesh materials, this boot is built to last. 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