The Carhartt Rugged Flex Insulated work boot gifts you unrivalled comfort and exceptional performance under any condition. It has Storm Defender waterproof breathable membrane and 400g 3M Thinsulate Insulation for added warmth. This lace-up work boot is designed with Rugged Flex rubber outsole to provide excellent traction and meets ASTM 2413-18 standards. The Swen-Flex® PR plate provides flexible non-metallic protection against sharp objects to the bottom of the foot.