Mil-Tec GI Boonie Hat MIL-TACS AU 100% Cotton S (54-55cm), M (55-56cm), L (57-58cm), XL (59-60cm), XXL (61-62cm) Comfortable and lightweight 4 air vents on both sides of hat. Scrim web strap attached around hat Adjustable chin strap. Wide reinforced brim. Internal map pocket Material: 50% Polyester, 50% Cotton