1. SPF 50 sun protection helps to protect your head and neck from harmful UVA and UVB rays. 2. Mesh vented sides encourgage air flow to help keep you cool. 3. Moisture wicking sweat band quickly disappates sweat to keep you cool. 4. Adjustable drawcord and locking clip at the back of the hat allows you to adjust tension for a comforable fit. 5. The adjustable chin strap secures your hat during windy contiditions and retains your hat if you need to quickly remove it. 6. Dark underside of brim reduces reflected light to reduce eye strain.