Russell Athletic Men's Core Performance Tee Stay cool and dry in the Russell Athletic® Dri-Power® Core Performance Tee while in the gym, on the court, or on the field. This men's T-shirt has a relaxed fit for complete comfort. 4.1 ounce 100% polyester interlock. Dri-Power® Moisture Wicking Technology. Heat sealed label. "R RUSSELL" on left sleeve end. Self-fabric crew neck collar. Set-in sleeves. UPF 30+, provides protection from the sun.