Protection in every direction, The Met Guard steel toe boots are flexible, lightweight, breathable and comfortable. They're built to exceed the ASTM safety standard for impact, compression resistance and metatarsal impact, and your standards, too. Protective thread includes DuPont Kevlar Aramid fiber on upper and welt for durability and heat resistance. External asymmetrical ABS metatarsal guard is hinged for comfortable protection, beneficial when squatting