HIKA Lightweight Outdoor Sun Shield Boonie Sun Hat, Anti-Mosquito with Net Mesh Fishing Hats Material :100% polyester Brim:3.5"(9cm);Circumference:22.8"(58cm) Comfortable fit to normal adult head circumference (21''-23'') Foldable,Hat can be folded for easy carrying. Neck cover can be put on to the front or back.protecting you from the sun and bite. Suitable for Fishing, Hunting, Hiking,Camping and Outdoor Activities