SPEEDSHELL FACE INSERT WITH H.O.T. FACE TECH A re-engineered face insert is our largest to date, wrapping further around the toe and sole area. A larger insert paired with H.O.T. Face technology delivers 23% more face flex than the previous generation DARKSPEED irons, unlocking faster speed, higher launch and even more distance. NEW INTERNAL ADAPTIVE WEIGHTING SYSTEM: The re-engineered PWR-BRIDGE weight positions the center of gravity lower, improving energy transfer and launch angle for more playable distance. HOLLOW BODY CONSTRUCTION: Inspired by metalwood designs, the hollow body construction in each iron improves weight distribution and creates a more flexible face, maximizing distance potential. TUNED ACOUSTICS AND FEEL: The hollow cavity is filled with soft foam to dampen vibrations, delivering exceptional sound and feel for a better playing experience.