Callaway X2 Hot Golf Balls Optimized Aerodynamics ForMore Distance Based on Your Swing Speed: Specifically engineered HEX Aerodynamicdesign has been engineered to optimizelift and drag for moderate swing speedsof 90 MPH and below to increase distance Straight Ball Flight: Low spin reduces hooks and slices formoderate swing speeds Softest Multi-Layer Design: Trionomer cover and fast tech mantledesigned to produce maximum ball speedwhile providing incredible feel and control Two Color Options: X2 Hot is available in traditional White or the newly formulated Optical Yellow for hotter visibility in the air or on the ground