Made from 100% polyester, this shirt provides SolarBloc UPF 50+ UV sun protection, whether wet or dry. The PURE-tech cool-wicking technology keeps moisture away from the skin, while M-shield offers permanent odor control. Perfect for Indoor/Outdoor athletic activities, And it fits true to size. All the Labels on this shirt are CONFIDENCE IN TEXTILES. Tested for harmful substances. According to Oeko-Tex Standard 100. Class I and class II certification.