The Under Armour compression training top wicks sweat away boosts muscle support and decreases fatigue. Made of HeatGear 4-way stretch fabric the base layer features stretch mesh underarm panels and back panels for targeted ventilation. Finished with anti-odour technology to help you stay fresh and UPF 30 to protect your skin from the sun's harmful rays. - A.D. HeatGear® fabric with all the benefits of UA Compression comfortable enough to be worn all day Stretch-mesh underarm panels deliver..