One Size fits most people, with a hat circumference of 22.5" and; a brim of 2.9"; You can adjust the size of the hat through the rope inside the hat, made of 90% paper straw and 10 % polyester. it can be easily carried inside your handbag or beach tote, is packable and convenient to carry, and save lots of space. A wonderful hat for wearing while gardening, at the beach, pool, park, camping, hiking, church functions, race day events, even out in your back yard Or any outdoor activities. Available in several colors and can be customized with a logo.