These Carhartt work boots offer the protection you need while remaining easy to move around in.. . . . . Leather upper. Work-Flex(R) Move-With-You fabric is durable yet easy to move in. Electrical hazard protection against incidental contact with 18,000 volts or less under dry conditions. Composite safety toe meets ASTM 2413-11 standards for safety toe footwear and ASTM F2892-11 for non-safety toe styles. Five layers of cushion and flexibility. Lightweight cement construction. Slip-, oil-, and chemical-resistant outsole.