The Sunblocker outdoor hat gives 50+ UPF protection and is the perfect hat for anyone needing serious sun protection. It is very lightweight and cool and can be crushed. This hat was tested by the Australian Radiation and Nuclear Safety Agency. 3.25" brim. 4.75" crown height. Crushable. Super lightweight. Chin cord with secure toggle. Mesh crown for ventilation. Organic cotton sweatband. Organic cotton inner pouch with care instructions. Handmade in Sri Lanka. Material: Supplex, organic cotton.