Caterpillar Device Waterproof Composite Toe Work Boot Men's CAT Footwear. Demanding work days call for demanding a lot out of your work boot. We built Device to live up to what you need, and maybe a little more. With our new Nano Toe technology designed to keep you safe without extra weight. Waterproof so that wet socks are never a worry. EASE comfort technology that’ll make the end of the day feel as good the beginning. Your days have needs - these boots have your back.. ASTM F2413-11 Non-Metallic Composite Toe protects against impact or compression. Full Grain Leather Upper. Nylon Mesh Lining.