100% Polyester. 0.15 lbs, it's very lightweight. UPF 30+ excellent sun protection. The brim length is about 3 inches. Quick-dry, The perfect combination of nylon fabric and Mesh liner. Light mesh panels for better ventilation keep you dry and snug, keeping your head free from stuffiness. Wonderful stitching process, convenient plastic-stiffened bill rear closure, Quick-release buckle adjustment. Hat circumference from 22-24 inches, One size fits most adults. You can easily get a custom fit according to your size. The pre-curved, long shape, protects the sun from your face and protects you from damaging rays. It is a perfect cap for hiking, camping, fishing, tourism, gardening, beach, pool, park, race day events, or any outdoor sports and activities in the upcoming hot weather.