The Draft UA Catalyst short sleeve fuses UA’s superior performance with advanced green technology—creating one of the toughest, lightest, most comfortable running T-shirts you’ll ever wear. Plastic bottles are melted down and stretched into super fine fibers that are used to create our ultra-soft and durable UA Catalyst fabric. Mesh insets are added to key ventilation zones to dump excess heat—keeping you cool and comfortable. The UA Draft T-shirt's raglan sleeves and flatlock seams eliminate chafing, and anti-microbial technology eliminates odors. Add to that 360° reflectivity for lowlight safety. What you get is lightweight running gear with everything you need and not an ounce more.