AR 670-1 Compliant for US Army Wear w/ Multicam and OCP; AFI 36-2903 Compliant for US Air Force Wear w/ OCP; Split-grain leather upper with heavy duty DD Grid is abrasion-resistant and allows feet to breathe; Boot opening is made with a backward-sweeping design for a snug fit without additional padding; Roller bearing and hookless rigging-proof hardware supports ankles, arches and lower shins; Vibram Bifida sole is rugged and stable for multi-terrain performance; Tapered nylon woven footboard provides impressive stability and shock absorption; Ergonomic injected nylon footbed ensures stress-reduction on your ankles and knees; Footbed cup system utilizes a unique heel retention system which supports your body at all times; Insole is custom-designed to ensure a great feel and fit throughout use