Rothco Olive Drab Rip Stop Boonie Hat - 5823. 100% cotton rip-stop material. Made to government specifications. Screened side vents. Branch loops. Chin straps. Perfect for fishing, hunting and everyday play. Made for durability. OD Olive Drab color. Approximate brim size: 2.5" - 3". Olive Drab - boonie hat (cotton rip-stop).