Tilley- The best, most practical outdoor Hats in the world The Tilley Airflo styles provide sun protection in a lighterweight construction. These unique design incorporates mesh into the crowns allowing coolness and comfort during hot days or strenuous outdoor activities. These styles have been certified as Excellent UV Protection (UPF 50+) blocking 98% of harmful UV rays. Like all Tilley Hats, the Airflo styles are guaranteed for life against wearing out; come with a 2-year, all-perils insurance policy against loss; float, ties on in gusty winds and are machine washable.