88% recycled polyester, 19% spandex UPF 50+ To make the product last longer, we suggest rinsing it after each use to get rid of any salt/chlorine residue Recycled polyester is a more sustainable fabric alternative produced by recycling existing materials (like plastic bottles and packaging) Size guide HIPS (inches) 2XS 33 ⅞ XS 35 ⅜ S 37.0 M 38 ⅝ L 41 ¾ XL 44 ⅞ 2XL 48.0 3XL 51 ¼ 4XL 54 ¼ 5XL 57 ½ 6XL 60 ⅝