Propper's 100% Cotton Sun Hat/Boonie is sewn to military specification MIL-H-44105B and is available in seven colors and patterns. Sewn extra-tough, to strict military specifications, as worn by U.S. flight crews; 92/5/3 Meta Aramid / Para Aramid / Conductive fibers, Full 2-way zipper with pull for easy on-off, 6 primary utility pockets, Adjustable waist belt with Velcro closure fastener, Left inseam knife pocket, Left sleeve pencil pocket, Gusseted back for freedom of movement and Machine wash / tumble dry.