This junior's Reactor ¼ Zip Training Top from Under Armour adapts to your body as you train. The lightweight top is deceptively warm, whilst the ColdGear Reactor insulation adapts to your core temperature to keep you cool as you exercise. The zip top makes it easy to slip on and off, with a high collar for extra coverage, as well as signature Under Armour branding as a mark of quality sportswear.