COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon-fiber (composite) toes offer unobtrusive fit and are 15% lighter than steel; These boots meet or exceed ASTM F2412 and F2413 M I/75, C/75 EH 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; The Kansas City Plus Mid work boots have a mesh 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: Oil- and slip-resistant, non-marking, rubber outsoles are used for improved traction that meet or exceed ASTM F1677 MARK II and ASTM F2913 SATRA Non-Slip Testing Standards; Non-mutilating uppers reduce the chance of marking surfaces COMFORT: Features KEEN.ReGEN technology; a lightweight, compression-resisting midsole providing 50% more energy return than standard EVA foam making safety footwear more comfortable; Made with a full grain waterproof leather upper