Sport-Tek PosiCharge Compression Sleeveless Tee ST121SLWhether worn for training or as a base layer, this compression tee is an essential piece of performance apparel.,5.1-ounce, 87/13 polyester/spandex with PosiCharge technology,Moisture-wicking,Odor-fighting,UPF rating of 50,Forward shoulder seams,**