The Tilley LTM3 Airflo Nylantium Hat- keep cool even on the hottest days with this breezy mesh crown hat. Weighing only 4 oz. it is lightweight but still durable; the Nylantium fabric is waterproof, machine washable and guaranteed never to shrink. There is a tie inside to keep the hat on in windy conditions, and the UPF 50+ rating means it has the highest level of sun protection available. The brim is 2 3/4" in front/back and 2 3/8" on the sides. A breezy hat perfect for keeping you cool while hiking, sailing, and any other activity where the sun shines bright.