Sport-Tek Ladies PosiCharge RacerMesh Polo. LST640Thanks to our ultra-fine flat back RacerMesh, this polo has unparalleled breathability for superior cooling. PosiCharge technology locks in color and keeps logos crisp-making this value-priced essential a fan favorite all season long., 3.8-ounce, 100% polyester flat back mesh with PosiCharge technology, Tag-free label, Self-fabric collar, Open placket, Set-in, open hem sleeves