Selling points: The new XR driver is designed to maximize speed through a variety of features, starting with a Speed Step aerodynamic crown that reduces resistance during the swing. A thinner face that's 10% lighter than in previous Callaway models transfers more energy across the hitting area. It also allows the CG to be placed 17% lower, which increases stability and forgiveness on off-center hits. In addition, a softer midsection in the new Project X LZ shaft loads more on the downswing. Meanwhile, Callaway's OptiFit adjustable hosel provides eight loft and lie configurations.
Our Takeaway: The XR driver fits nicely alongside the Big Bertha Alpha 815 line and is best suited for players who can use a little extra swing speed achieved through increased aerodynamics. The lower-spinning XR Pro is more appropriate for better players.
Fine print: The OptiFit hosel allows for loft (from 1° stronger to 2° weaker) and lie changes to optimize launch conditions. The XR is available in standard lofts of 9°, 10.5°, 12°, 13.5°.
Bottom line: $350