Boonie caps originated in the military to help soldiers keep the sun out of their eyes and the rain off of their heads. The Avery Heritage Rounded Boonie is great for providing you with sun and light rain protection for your favorite outdoor activities. Features8 oz Waxed cotton weather and abrasion resistant constructionWide brim for maximum sun and rain protectionClassic military design adapted for hunting Large: 7 1/4 - 7 3/8 hat sizeXL: 7 1/2 - 7 5/8 hat size