Built for work in cold environments, the Arctic Sport Steel Toe Insulated Boot will keep feet warm, dry, and comfortable while meeting ASTM safety requirements. It keeps you working at your best when mother nature is at her worst. 2mm Thermal Foam Under Foot Steel Toe Shank ASTM F2413-11 M I/75 C/75 EH Warm Fleece Lining 5mm Neoprene Bootie for Comfort and Performance Self-Cleaning MS-1 Lug Outsole is Excellent in Mud, Snow and Dirt 100% Waterproof, 100% MUCKPROOF EVA Midsole for Added Comfort