A US Lacrosse Member Store EXCLUSIVE, the Men's US Lacrosse Under Armour® Men's Core UA Tech™ Polo Shirt is made of 100% polyester with Moisture Transport System and HeatGear® fabric technologies for a cool, comfortable feel. Anti-odor fabric technology helps inhibit the growth of odor-causing microbes. 3-button placket. Short sleeves. Self-fabric collar. Loose fit.