Perfect for players seeking a grip that provides excellent all-around performance in a smoother, tackier and more tactile feel that also offers exceptional all-weather playability, the ST Hybrid Calibrate features a variety of breakthrough technologies, including the Calibrate reminder to promote consistent hand placement for better control and the all new "Smooth Tack" Genesis Material incorporated into two distinct zones to provide more traction in the upper hand and soft tactile feel in the lower.