ZAPT Tactical Head Wear / Boonie Hat Cap For Wargame Sports Hunting Fishing Outdoor Hat Camouflage Caps Inner Diameter measures 7 1/2", Brim measures 2 1/2" Wide, Crown measures 3 1/4" High. Adjustable chin strap ensures a secure fit Foldable, very convenient to take it anywhere Wide brim and screened side vents are sure to keep you cool in the blazing sun