100% polyester provides SolarBloc UPF 50+ UV sun protection wet or dry. plus PURE-tech cool-wicking Technology keeps moisture away from skin, and M-shield permanent odor control. color wont fade from exposure to the elements. fits true-to-size. the shirt length hits just below the hip to prevent riding up while active. All the Labels in shirt are CONFIDENCE IN TEXTILE. Tested for harmful substances. according to Oeko-Tex Standard 100. Class I and Class II Certification.