Designed with a medium brim that snaps up Aussie style, the Tilley Endurables LTM5 Airflo Hat features a 1.9cm polyester mesh in the crown for coolness and comfort during hot days and strenuous activities. It's made from 100 percent supplex Tilley Nylamtium, a form of lightweight nylon that's both lightweight and resistant to water and mildew. The fabric has also been certified to block 98 percent of harmful UVA/UVB radiation and deliver an ultraviolet factor (UPF) of 50+--the maximum rating given. Other features include a dark underbrim for glare protection and floatability. It also ties on in windy conditions. Each Tilley hat is hand-sewn and all seams are lock-stitched so they won't unravel. It also comes with a secret pocket in the crown to safely and securely store items such as a driver's licence, room key, or a $20 bill. Machine wash on delicate cycle separately or hand wash in cool water. Do not use bleach. Guaranteed for life not to wear out.