The Tilley TM10 has 3 inches of water repellent mesh around the sides of the crown let a breeze pass through for cooling comfort. The tops of the crowns are shaped similar to many fedoras or western hats and their shape isn"t lost after washing. The 100% cotton duck brim blocks sunlight and keeps you cool. Tilley Mesh Hats have been tested and certified as having a UPF 50+, the maximum UV protection rating given. The TM10 Mesh Hat is styled with the broader brim size of the Tilley T4 model.Washing Instructions: Machine wash in warm or cool water. Do not use bleach. Smooth and reshape the Hat by hand and set it out to air dry. Special orders usually take about 3-4 days to ship.