150 Denier polyester twill material with double hemstitched pockets and seams to increase wear resistance from washing. Built to last heavy-duty brass snaps and grommets. Mesh side vents. Dual reflective chest strapst. Cell/radio pocket with hook-and-loop fastener. Safety D-ring slot access on back. 14" zippered pack across entire back area. 8 pockets with hook-and-loop fasteners (5 outside; 3 inside). Brass grommets on lower front pockets for surveyor tape dispenser. Long ruler slot pocket on left back.