Rigorously tested and recommended by dermatologists worldwid. Coolibar guarantees UPF 50+ protection for the life of the garment as set by ASTM/AATCC standards. Coolibar tests every fabric in every color and every pattern against multiple standards before we ever stitch a garment. Coolibar measures all fabric performance against the Australian New Zealand UPF testing standards, the world's highest rating standard, as well as U.S. standards. Coolibar's level of sun protection exceeds all published rating standards of UPF 50, yet because the industry standard for certification stops at UPF 50, Coolibar indicates that they go above and beyond by using the "+" symbol. NWT Please Note: The color of photos can vary significantly across display screens. Feel free to ask any questions before purchasing. Smoke and Pet Free Environment.