Beautiful sun protection is the Sundancer Hat. Fashioned after one of the best selling sun hats, the Adventure Hat, the Sundancer provides complete 360 degree solar coverage. Utilizing ultra lightweight sun protection fabric offering 50 UPF (Mesh vents not rated) allows this hat to feel nearly weightless (only 4 oz). The Sundancer Hat remains cool and comfortable all day long regardless your activity with mesh side vents and wicking headband. 4 1/2" front brim with floatable foam core and poly brim wire. A 7.5" back veil with flattering pleats. You can feel confident knowing your nose, cheeks, lips, eyes, ears, and neck have an excellent UV shield. One size fits all with an unique rear sizing tape at the back with added elastic for extra security. A chin strap with cord lock keeps the hat from blowing away. Sizing (Head circumference): Medium: 21-23.5", Large: 23.5-24.5".