The number one feature of UPF fabric is that it offers sun protection. A UPF rating helps you know how much UV protection a piece of clothing provides. (UPF stands for "ultraviolet protection factor" and it's a measure of how much of the sun's rays can penetrate the fabric and reach your skin.) The Skin Cancer Foundation rates anything above a UPF 30 as "very good protection," but most of Title Nine's sun-protective clothing is UPF 50+ (rated as "excellent protection"). But our UPF gear has more going for it than just being great at sun protection: - If you're hitting the surf, the beach, the river, or the pool, our solid swimsuits made with SurFlex(tm) swim fabric is resilient, sag-proof, and fade-resistant.