Muckmaster black 16" knee boot. For those in need of rugged but comfortable, waterproof footwear, the Muckmaster is the ideal boot. Breathable Airmesh lining, molded midsole with contoured foot bed, and a 2mm thermal foam underlay added to the instep area for added support ensure all day comfort. Molded, durable, rubber outsole, with additional achilles reinforcement and added toe protection provide maximum protection in the most demanding work environment. Kick rim for hands-free removal. Comfort range of 85 degrees F to sub-freezing conditions.