Men's Dr. Martens IRONBRIDGE Internal Met Guard Boots. Truly rich Dr. Martens safety boot built to the highest standards with an internal metatarsal guard made with D3O technology. Features a water resistant leather upper, Smartmask PU-cushioned footbed, and classic air-cushioned sole. This sole is hard-wearing, with good abrasion and slip resistance. This is an oiled and tumbled, water resistant leather.