UA Youth HeatGear Armour Shortsleeve Tee HeatGear fabric, with all the benefits of UA Compression, comfortable enough to be worn all day Stretch-mesh underarm panels. UPF 30+ protects your skin from the sun's harmful rays. 4-way stretch fabrication allows greater mobility. Moisture Transport System wicks sweat. Anti-odor technology. Mesh panel on back neck with ARMOUR wordmark.