Charles River 3920 M’s Solid T-Shirt Interlock The Men’s Tru Performance Tee is 100% Polyester Interlock (black is 4.42 oz/yd2, white is 5.31 oz/yd2) with crewneck styling and allover double needle coverstitch. It features side slits for increased mobility and a heat-sealed back neck label for comfort. Moisture wicking and antimicrobial properties keep you cool and dry when you get moving. A great layering piece to take your look to the next level.