Smitty Volleyball Referee Shirt with Pocket. Smitty ComfortTECH polo shirt that is just perfect for volleyball. This shirt has a front left pocket. Our ComfortTECH 100% polyester mesh with 3 button placket and color matching buttons. Extended tail with side vents. ComfortTECH Moisture Management fabric offers advanced technology to keep you cool, dry and comfortable. This specially engineered fabric contains properties that transports moisture away from the body, without stickng to the skin, creating a natural system for moisture evaporation. It also features anti-bacterial treatment to assure freshness.