Callaway X Hot Irons
The callaway's new X Hot irons employ a thinner face design for improved ballspeed. That's not new, but through a unique undercut cavity, the X Hot irons are designed to lower the area of the face that is most flexible in an effort to put it in line with where most iron shot impacts occur: low on the face.
"The X Hot Irons have been meticulously engineered - both in terms of physical characteristics and club configuration--to increase ball speed and promote overall distance optimization," said Alan Hocknell, Callaway's Senior Vice President, research and development. "And in doing so I think we have raised the bar and created the standard in distance for the irons category."
The new irons borrow a piece of technology long seen in its driver technology. The irons look to increase energy efficiency on hits by optimizing stiffness to different degrees across the face.
The X Hot iron line's deep undercut cavity is meant to allow engineers to lower the "sweet spot" on the club. The redesigned face is meant to increase ball speed on off-center hits.