Offering 360-degrees of sun defense, Rothco’s Adjustable Boonie Hat with Detachable Neck Cover is fully adaptable to fit most head sizes. This hat provides unbeatable sun protection with its circular brim and detachable neck cover. Snap buttons along the backside of the brim allow for easy attachment and removal of the neck flap. The adjustable elastic cord and lock on the crown enable you to find the perfect fit. This boonie cap features an internal map pocket with a 6.25-inch opening, ideal for storing maps or other paperwork.