The 2415 is an update to the classic wedge bottom boot. It has a waterproof membrane, is lightweight, and features a composite safety toe that meets or exceeds ASTM F2413 standards, and very flexible for ease of movement. Model: 2415 Full grain, waterproof Red Oak Mesa leather Nylon covered polyurethane foot bed Goodyear leather welt (sole is stitched to boot) RW waterproof membrane - Guaranteed to keep you dry Nano-Toe Technology: Nano Carbon fiber that is lighter, yet stronger than fiberglass. Safety Rating: ASTM F2413-11, M, I/75, C/75, EH (Electrical Hazard-rated) -This boot meets or exceeds ASTM F2413-11 standards The rubber-blown traction-tred is rated "Best" for slip resistance and oil/gas, is "Best" against abrasions, "Good" handling heat and chemicals, and is non-marking