This Straw Sun Hat is made of 90% paper straw and 10 % polyester. Straw material. Soft comfortable and breathable to wear. One Size fit most people,hat circumference 23.5″, you can adjust the size of the hat through the rope inside in the hat. It’s a great essential accessory for your outdoor travel,holiday,beach playing. folding packable design for easy storage in a handbag or backpack when it is not in use. Convenient carrying for wearing while gardening, at the beach, pool, park, camping, hiking, race day events, even out in your own back yard or any outdoor activities.