Designed as a vertical assault weapon, the Danner Flight Assault (DFA) features low oil content nubuc leather, a lightweight 1000 Denier nylon upper, a hexagonal low lug outsole with a patent pending Vertical Insertion Arrestor (VIA) technology insert which provides abrasion resistance and superior control in fast roping applications. 100% waterproof and breathable GORE-TEX liner is engineered to keep your feet dry and comfortable - even in extreme conditions.