under armour men's rival polo under armour under armour men's rival polo 100% polyester textured fabric is soft, light & breathable material wicks sweat & dries really fast anti-odor technology prevents the growth of odor-causing microbes mesh insets on sleeves cuffs for added breathability heatgear® is engineered with a microfiber blend fabric featuring the signature moisture transport system and reliable compression. it's designed to fit tight to your skin, under your outerwear. ...