Designed with a lightweight and flexible cement construction, these waterproof work boots feature a Crazy Horse leather upper, a mesh lining with waterproof SCUBALINER™, a removable dual-density foam footbed, a PC2™ internal polyurethane midsole, a rubber outsole, a nylon shank, a Rubberflex internal metatarsal guard, and a round toe.Rubber internal metatarsal guards are made from rubber blends engineered to provide maximum impact protection and flexibility. They retain their shape without sacrificing comfort or performance. They meet or exceed ASTM Class 75 Metatarsal Protection standards. This 100% nonmetallic footwear features a composite toe that will not activate security screening devices.Note: This footwear is designed to provide secondary protection from incidental contact with live electrical circuits. It meets F2413-11 Section 5.5 requirements and is tested to resist the application of 18,000 volts at 60 Hz for 1 minute with no current flow in excess of 1 milliampere under dry conditions. It should not be worn in explosive or hazardous areas where conductive footwear is required.