FEATURES:

• MAINFRAME
  Designed with the help of AI, MainFrame uses a variable network of grooves, channels, and cavities milled into the backside of the club face on ZipCore XL's 4i–7i. This pattern helps maximize flex at impact for better COR. MainFrame also uses weight pads to position mass low and deep, boosting MOl and optimizing the Center of Gravity for more forgiveness.
• ZIPCORE
  In 8i–SW lofts, ZipCore replaces heavy steel in the hosel and heel with an extremely lightweight yet strong, vibration dampening material. This sets the Center of Gravity right where you strike the ball, giving you more consistent launch, spin, and distance. Coupled with our XL Head Design, ZipCore delivers an abundance of high/low and heel/toe MOl for increased forgiveness, feel, and control.
• XL HEAD DESIGN
  Our XL Head Design features a large, cavity back profile with enhanced shaping and weighting throughout the entire lineup. Thanks to the additional weight savings from ZipCore and MainFrame, we reallocated this weight to the perimeter of the clubhead, upping the MOl for incredible forgiveness.
• HYDRAZIP
  ZipCore XL Irons feature HydraZip, along with loft-specific grooves, to balance spin performance on every club throughout the lineup.In 4i–7i lofts, HydraZip uses a rougher face blast, with wider, flatter grooves, to help reduce unwanted spin that can eat away at your carry distances. Then, 8i–SW lofts receive a slightly smoother blast, but with thinner, deeper grooves to boost spin on approach. Wedge lofts also receive laser milling for superb short-game control and better performance in wet conditions.
• V-SHAPED SOLE
  With an elevated leading edge, our V-Shaped Sole helps these Irons glide through the turf without dragging like a typical flat sole would, which helps you maintain all that power you generated throughout your swing. A lower trailing edge on the back end still preserves some workability for shaping shots.
• ACTION MASS CB
  Action Mass CB places an 8-gram counterweight in the end of the shaft near the very top of your grip. The feel of added weight in your hands helps the club seem lighter, promoting a more stable, controlled backswing. It also helps promote a more inside swing path, squarer club face through impact, and, ultimately, straighter shots.
  
• Specifications are available here