Fitted: Next-to-skin without the squeeze HeatGear® fabric is ultra-soft & smooth for extreme comfort with very little weight Stretch-mesh underarm & back panels deliver strategic ventilation 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat away from the body Body: 135g Polyester/Elastane Mesh: 100g Polyester/Elastane Hit your work with the dynamic comfort and support of Under Armour's Raid Short Sleeve T-Shirt.