KEEN Utility Men’s Reno Mid Height Composite Toe Flexible Waterproof Athletic Work Boots COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon-fiber toes, a composite material, offer an unobtrusive fit and are 15% lighter than steel; These work boots meet or exceed ASTM F2412 and F2413 M I/75 and C/75 Standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane liner that lets vapor out without letting water in for keeping your feet dry and comfortable; These boots have a liner that integrates with the waterproof membrane SUPPORT: Featuring KEEN.BELLOWS FLEX technology which allows the footwear to bend and flex 3x easier; These boots are made with KonnectFit heel-capture system for a locked-in feel, and 100% non-metallic construction for passing through metal detectors TRACTION & PROTECTION: Oil- and slip-resistant, non-marking, rubber outsoles are used for improved traction that meet or exceed ASTM F1677 MARK II, ASTM F2913 SATRA Non-Slip Testing Standards