Men&rsquo;s Outback Safari Sun Hat w/ Chin Strap, Mesh Crown, 50+ UV Sun Protection 100% Polyester Mens summer outback sun hat with mesh crown and adjustable chin strap Features 3 inch wide brim to shield your face, ears and neck from the hot sun Crown features mesh fabric that allows heat to escape and air to flow Comes in three sizes: M (about 22 inches) L (about 22  inches) and XL (about 23 inches) The top and brim offer UPF 50+ which blocks 97.5% of the suns UV rays