This beautiful blue bathing suit with a zipper in front size M. UPF 50+. Very comfortable. For more than 20 years, Coolibar has been innovating UPF (ultraviolet protection factor) 50+ fabrics and UPF clothing guaranteed to block 98% of UVA/UVB rays, providing UPF 50+ sun protection clothing you to wear. As a result, Coolibar was the first clothing company to receive The Skin Cancer Foundation's Seal