The Tilley LTM6 AIRFLO® Hat is made from Tilley Nylamtium®, a strong water-and-mildew resistant form of nylon and features 3/4″ polyester mesh built into the crown for superb ventilation. This lightweight hat is designed with a wide down-sloping brim for those who prefer ample sun protection and shelter from rain. Adjustable, tuckaway, Fore’n’Aft wind cord keeps hat in place. Dark underbrim reduces glare from water, sand and pavement. Rain repellent (except where it’s obviously not quite). Closed-cell foam in the crown adds buoyancy. Packable, crushable – throw it in your backpack, suitcase, or golf bag; it comes out looking good! Tilley provides a full 100% guarantee for the life of their hats. They are guaranteed not to shrink, tear or even fall apart.