Simply the best hat on the planet and it floats! The Tilley Airflo® provides sun protection in a lightweight construction, engineered from Tilley Supplex®, a strong water-and-mildew resistant form of nylon. Tilley Airflo® designs incorporate mesh into the crown allowing coolness and comfort during hot days or strenuous activities. The LTM5 has a semi-sloping front and back brim and a relatively high crown. A layer of closed-cell foam in the crown, and sometimes in the brim, provides the Tilley's positive buoyancy making it a boon to those who boat and fish. Tilley Hats are GUARANTEED FOR LIFE and INSURED AGAINST LOSS by the manufacturer and, if that weren't enough, the Tilley Airflo is MACHINE WASHABLE (WON`T SHRINK) and it weighs only about 3 ounces!