Rothco's Adjustable Boonie Hats feature an adjustable elastic cord with cord lock, 4 screened vents, adjustable chin strap. Modeled after the classic military boonie hat, Rothco's adjustable boonie hat one size will fit most. The boonie hat is available in both camo and solid colors and is great for screenprinting and embroidery. Made of 55% Cotton / 45% Polyester. Fits Head Sizes 6 3/4" to 7 3/4" (Total Circumference Approximately 23 1/2").