Pushing the edge as manufacturers are doing these days, it was only a matter of time before something like this happened.
Although the Sumo² (the square one) had been approved by the USGA, apparently an unnamed equipment competitor went to the USGA in late February and made a complaint. Upon subsequent testing, the USGA notified Nike that a number of clubheads were found to be non-conforming.
Conforming models will be shipped within a month. They’ll come marked with a circular notch on the soleplate indicating they conform to USGA rules. Nike has a plan where consumers can trade in their drivers beginning March 26 either through their website or by calling 800-632-6453. The recall period will run until April 30. You can watch a video of Nike Golf President Bob Wood’s mea culpa here.