"We can officially only rate these warmers at UPF 50+, but in our laboratory tests they actually blocked 99.8 percent of damaging UV rays. We used a polyester base that is not only more effective than nylon at blocking UV rays but is also much better at keeping you dry, which means these skins are better in both cooler and warmer conditions. Weve kept the construction very clean to eliminate seams that can rub, and we used our double-sided silicone elastic to make sure they stay in place. They fold up extremely small, so theyre great to stick in your pockets for your next big mountain day." Brand Manager Castelli - By Steve SmithProduct featuresSolare fabric keeps the chill off without causing overheatingUPF 50+ protectionPolyester based for excellent moisture managementDouble-side silicone elastic at top for excellent gripAnkle zip for easy on/offWeight: 219g