WHAT'S IT DO? This thing does what ordinary athletic T-shirts can’t even pretend to do. Our Men’s HeatGear® Compression T-Shirt gives you ridiculous stretch to keep you mobile. The compression fit boosts muscle performance. Odor-blocking fabric wicks sweat to keep you cool, dry, and light. And the 30+ UPF protects against the sun. Simply put, this sets the standard for compression baselayer T-shirts. That's why so many have tried to imitate it. THE FUNDAMENTALS COMPRESSION: This ultra-tight, second-skin fit delivers a locked-in feel that keeps your muscles fresh & your recovery time fast. Smooth and sleek HeatGear® fabric is light, durable, and comfortable, so you won't be weighed down Lightweight, 4-Way Stretch construction improves your range of motion and dries faster Signature Moisture Transport System wicks sweat to keep you cool and dry Anti-Odor technology prevents the growth of odor-causing microbes to keep your shirt fresher, longer 30+ UPF protects your skin from the sun's harmful rays Smooth Flatlock Seams prevent chafing Heat-sealed UA logo and back lockertag 5.0 oz. Polyester/Elastane Imported.