The sun hat is made of 100% polyester, quick dry, lightweight, and waterproof.This bucket sun hat circumference is 21- 23 inches, it fits both men and women. It has adjustable elastic buckle string at the back, you can easily adjust it for your comfort. And you can also adjust the removable chin strap under this sun shade hat to keep it firmly in place on windy days.You can easily have it folded up. When you have no need to put it on, this sun hat can be easily folded up for storage. It has a hook on the inside, once folded up, you can easily take it around, hooking it to your backpack or even jeans. a perfect for beach, pool, park, travel, golf, fishing, gardening, hiking, camping, hunting or any outdoor sports and activities.