Compression: Ultra-tight, second-skin fit for a locked-in feel. UA Compression, strategically placed to be stronger in the places you need it more. Mesh underarm panels for greater ventilation 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes ARMOUR wordmark on back neck. Red UA Zonal Compression ¾ Sleeve Shirt has 84% Polyester/16% Elastane