Let all-new Power Play System Q Adrenaline driver fuel your rush. Drag is evident in any object moving at fast speeds. The lower the drag, the faster the object will move. Think boxy cars vs a Ferrari. The Adrenaline driver incorporates wind-tunnel tested slipstream technology, which optimizes the head shape for reduced drag and faster clubhead speed. Plasma welded construction allows us to redistribute weight and move the center of gravity to its optimal location to create the longest, more powerful drives you have ever experienced.