5.11 Men's Skyweight Waterproof Side Zip Boot Military & Tactical 50% Leather/50% Nylon Imported Rubber sole Full-grain leather and nylon upper with event waterproof, breathable, blood borne pathogen resistant membrane Rugged outsole features forefoot lugs, arch lugs and a heel brake for unparalleled traction Full-length cmeva midsole with nylon shank features 8 mm heel-to-toe drop Non-metallic construction utilizes nylon shank Ykk zippers