NYFASHION101 Women's Summer Packable Bow Accent Foldable Brim Beach Sun Hat One size fits most for this beach sun hat. This hat is made with 55% linen and 45% cotton. Unfolded brim length measures 5.0". Internal adjustable drawstring for a secure fit on breezy days. This sun hat blocks 88% UVA/UVB rays, with UPF 50+ as well. Stay shaded and keep cool with this stylish, fun, sun hat!