Callaway Golf X2 Hot Golf Balls - Sleeve (3 Balls) Optimized Aerodynamics For More Distance Based On Your Swing Speed STRAIGHT BALL FLIGHT : The low spin reduces hooks and slices for moderate swing speeds. Because long drives look even better when theyre in the fairway. SOFTEST MULTI-LAYER DESIGN : Maximum ball speed with exceptionally soft feel and control. Thats music to your ears if youre a golfer. And thats what you get from the Trionomer cover and fast tech mantle.