Sport-Tek® PosiCharge Tough Mesh? Full-Button Jersey. ST220 With buttons placed for ease of embellishment, this classic jersey scores with its durable (yet soft and smooth) PosiCharge Tough Mesh. � 5.3-ounce, 100% Cationic polyester flat back mesh � Set-in sleeves � Double needle sleeves and hem � Dyed-to-match buttons � Tag at hem