Mizuno’s 2023 drivers—the ST-Z 230 and ST-X 230—have landed on the USGA conforming clubs list. While that clears both models for play on the PGA TOUR, Mizuno is mum on the technical details and what improvements golfers can expect over the soon-to-be previous models.
Mizuno ST-Z 230 and ST-X 230
The most intriguing teaser is the addition of a “CORTECH CHAMBER” in the front sole area where we’d typically expect to find Mizuno’s Wave Sole. The best (and, I suppose, obvious) guess is that it’s a bit of speed-enhancing tech particularly beneficial on low-face impact.
Because it’s the driver category, we should expect claims of modest ball speed gains.






































