SunBusters Boys UPF 50+ Sun Protective Solid Short Sleeve Rash Guard 80% Nylon/20% Spandex Imported Sun protective boy's swim shirt with full-length short sleeves EXCELLENT SUN PROTECTION: Swimwear fabrics are rated UPF 50+ and provide maximum UV sun protection by blocking 98% of UVA + UVB sun rays, wet or dry; similar rating as SPF for sunscreens. Covered areas don't need sunscreen. High collar for optimal sun protection and flat lock stitching for superior quality Solid rashguard for a clean look with SunBusters logo at chest Fabric is soft, quick drying and offers 4 way stretch