Whether you're walking the dog or running a mile, the GSX Hyper-Formance Muscle Tee keeps you cool and comfortable for the long haul. Lightweight 100% polyester micro-interlock fabric wicks away sweat so you stay dry, while offering UPF 30+ sun protection to shield your skin against harmful UV rays. An antimicrobial treatment helps reduce odors, ensuring that you stay fresher longer. This sleeveless t-shirt features a classic crew-neck collar for a snug, but not-too-tight fit. Imported.