Under Armour Tech Half Zip Top UA Tech is our original go-to training gear: loose, light, and it keeps you cool. It is everything you need. UA Tech fabric is quick-drying, ultra-soft and has a more natural feel. Material wicks sweat and dries really fast. Generous 1/2 zip front makes for easy layering. Odor control technology minimizes odor. Main body fabric contains at least 30 percent polyester, excluding trims and embellishments.