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. 100% Waterproof, 100% MUCKPROOF 2mm Thermal Foam Under Foot 5mm Neoprene Bootie for Comfort and Performance ASTM F2413-11 M I/75 C/75 EH EVA Midsole for Added Comfort Self-Cleaning MS-1 Lug Outsole is Excellent in Mud, Snow and Dirt Steel Toe Shank Warm Fleece Lining