'The pocket-free version of our immensely popular Soleil Top expands the activity horizon. UPF 50+ micropoly spandex makes the Soleil Free an ideal rashguard; streamlined shape allows for bulk-free layering; elastic-free arms and hemline won't bind or chafe. Athletic fit. Fabric: 88% micro polyester/12% spandex with UPF 50+Ultraviolet Protection Factor (UPF) indicates what fraction of the sun's ultraviolet rays can penetrate the fabric (50 = 1/50th of the sun's rays). The higher a garment's UPF, the greater the amount of protection.'