Tesla CLSL TM-MTS03-KKZ_X-Large Men's HyperDri Short Sleeve T-Shirt Athletic Cool Running Top MTS03 PlazmaSkin Fabric geared for all activities and sports (100% polyester.) Excellent breathability and ventilation Moisture Sensing/Quick time/Two-way air circulation Lightweight and comfortable without sacrificing mobility (UPF 50+) Safeguards your skin from harmful Ultraviolet Rays