Tilley's best-selling broad brim airflo hat sets the standard by which all other outdoor hats are measured. Constructed of lightweight, breathable supplex nylon with a cooling 3/4in airflo mesh band in the crown, this topper provides excellent sun protection, ventilation and moisture management - and may very well be the last hat you ever buy designed with a medium brim that snaps up aussie style, the tilley endurables ltm6 airflo hat features a 3/4-inch 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 license, 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.