Caterpillar Men's 9 Medium Threshold Waterproof Full Grain Leather Upper Boot. This boot features a moisture wicking mesh lining, moisture wicking mesh footbed lining, cement construction, slip resistant, electrical hazard, and waterproof. The Threshold Waterproof work boot is made with seamed seals for water protection, an incredibly slip resistant outsole that exceeds ASTM standards and a full grain leather for extreme abrasion resistance.