The sun shield boater hat features a hidden supplex fabric shield. The shield can be taken out of the brim to be used only when necessary. Excellent UV protection 40+. Includes a small vent in the crown for air circulation. This hat also floats and is crushable. 3.25" brim. 4.25" crown height. Ventilated crown. Chin cord with secure toggle. Organic cotton sweatband. Organic cotton inner pouch with care instructions. Clip system to keep your hat secure. Handmade in Sri Lanka. Material: Nylon, supplex, organic cotton.