Product DNA What's It Do? HeatGear® Armour is our original performance replacement for old-school tees. It's tight to wick away sweat and quick-drying to keep you cool. We've come a long way since that first innovation—but that core, next-to-skin layer is still something no athlete can go without. The Fundamentals Compression: Ultra-tight, second skin fit HeatGear® fabric, with all the benefits of UA Compression, comfortable enough to be worn all day Stretch-mesh underarm panels deliver strategic ventilation UPF 30 protects your skin from the sun's harmful rays 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Mesh panel on the back of the neck with ARMOUR wordmark Body: 140g Polyester/Elastane Mesh: 130g Polyester/Elastane