Military Boonie Hat – Camo Camouflage Cotton Wide-Brim Made of a Polyester/Cotton Blend Four Screened Side Vents (two on each side) Branch Loops – Loops woven into sides for leaves and branches Adjustable Chin Strap Military Style Boonie Hat made to Government Specs Sizing Information S M L XL Hat Size 7 7 1/4 7 1/2 7 3/4 Head Circumference 21 7/8″ 22 5/8″ 23 1/2″ 24 3/8″