Our CoolShirt by Luna-C products were developed in partnership with Coolshirt Systems. Utilizing Luna-Cs coldblack and energear technologies, this shirt is loaded with features! When a dark colored shirt is treated with coldblack it will maintain a similar temperature as a white shirt when exposed to sunlight. It also provides UV protection, which is why we also treat light colored shirts with coldblack. Energear is an energy recovery system for the body. This treatment reflects FIRs (Far Infrared Rays) back into the body resulting in an increase in oxygen, which reduces fatigue, increases concentration, and decreases recovery time. Coolshirt by Luna-C products are made with 100% Peruvian combed cotton