Natuworld Outdoor Fishing Hiking Hunting Boating Snap Brim Camouflage Boonies Bush Safari Hat Cap with Anti-mosquito Bees Fly Breathable Mesh Neck Flap Great for most outdoor activities ...Fishing, Hiking, Boating, Hunting Material : Cotton 65% + Polyester 35% Mesh neck flap protects from the mosquito bees , breathable and comfortable Chin strap with cord lock to keep secure Best Fit From 21 1/2"-23" Head Circumference (Hat Size 6 7/8 - 7 1/4).