This is Tilley's overall best-selling Hat! With its broad brim, great sun protection (fabric is certified UPF 50+, the highest given) and 3/4" mesh around crown allowing for extra ventilation we understand why we see the AIRFLO� Hat on so many heads. Water-repellent finish keeps off the rain. Front & back wind cords system secures Hat in gusty conditions. Hydrofil� sweatband to wick moisture away. Keep valuables safe in the secret pocket. Stays afloat in water.