Under Armour Alter Ego Compression Short Sleeve Superman Bright Blue Small Compression: This ultra-tight, second-skin fit delivers a locked-in feel that keeps your muscles fresh & your recovery time fast. HeatGear fabric, with all the benefits of UA Compression, comfortable enough to be worn all day 4-Way Stretch fabrication allows greater mobility in any direction Signature Moisture Transport System wicks sweat away from the body with Anti-Odor technology that prevents the growth of odor causing microbes UPF 30+ protects your skin from the sun's harmful rays