The Tilley Airflo® provides sun protection in a lighterweight construction. Tilley Airflo® designs incorporate mesh into the crown allowing coolness and comfort during hot days or strenuous activities. Engineered from Tilley Nylamtium®, a strong water-and-mildew resistant form of nylon. The LTM5 is the Airflo® version of our LT5 Hat. It has a semi-sloping front and back brim and a relatively high crown. Measurements: Front Brim: 2 5/8\", Back: 2 3/4\", Sides: 2 1/8\"