Racquets flex at contact, which Tecnifibre refers to as “breathing.” VO2 Max Technology is designed to regulate “breathing” by putting carbon fibers at the 5 and 7 o’clock positions on the T-Fight 320 head to limit the flex, increase control and prevent twisting. Playtesters found a solid response with the frame, though some wished more pace came along with it. The racquet has plenty of weight, but it’s head light. So while it’s easy to swing, it makes you work for your power. Still, the maneuverability came in handy at net and added to the all-court appeal of the frame. The open string pattern (16-by-19) aided in producing spin and kept the mid-plus string bed from feeling too stiff. The racquet-makers at Tecnifibre expect hard-hitting advanced players to use the racquet, so they put silicone in the handle to reduce the vibrations associated with using thick, control-oriented strings such as polyesters. The T-Fight 320 VO2 Max is used by Gisela Dulko.