The unique Squishee® straw material blocks up to 95% of the sun's ultraviolet rays, protecting your skin from overexposure and premature aging. Blocks 95% UVA/UVB rays. Look your best while enjoying the sun! Independent testing in accordance with AATCC (American Association of Textile Chemists and Colorists) test methods have determined this product’s effectiveness for blocking ultraviolet radiation as well as UVA/UVB radiation. This product was awarded the highest rating of UPF 50+.