ST-X

Heel-side weighting provides draw bias plus very good MOI performance — independent commentary noted Mizuno shaved mass around the head to boost MOI vs the predecessor. Perimeter weighting strong by 2021 standards. Reviewer testing noted feedback on mishits is jarring and pure forgiveness sits below dedicated game-improvement peers. Solid mid-tier 2021 forgiveness with draw-bias gear-effect helping slicers stay in play.

Reviewer testing called the head "the longest Mizuno driver tested to date," and a tour staffer topped PGA Tour driving distance stats (326.1yd average) the week the family launched. 2nd-gen SAT2041 Beta Ti face — 17% more tensile strength and 8% more flexibility than 6-4 Ti — produces strong ball speeds at the centre and on lower-face strikes. Top-tier 2021 distance for a draw-biased head.

Built-in heel-side draw bias and a single fixed 11g sole weight constrain shape-tuning hardware. But the deep-face geometry allows shape-makers to override the bias — a tour staffer reported he "could cut or draw it with the ST-X" where the ST-Z stablemate "just wanted to go straight." Reviewer testing noted the head "offers the most workable flight of the two head styles" within the family. Workability is more accessible than typical draw-biased heads — but only for accomplished ball-strikers.

Reviewer testing called the feel "fantastic — solid and explosive from a wide area, encouraging feelings of power" — "feels closer to a forged iron than most modern woods." Tour players specifically asked for a more solid or dense impact sensation, and tweaks to the titanium face design plus vibration-absorbing carbon fiber sole panels produced "a really pleasing impact sensation." Best-in-class 2021 driver feel — forged-iron tactile DNA preserved.

Acoustic profile reads quiet and medium in pitch on centred strikes — a fine complement to the feel, while mishits are louder and add to the jarring quality of off-centre feedback. The impact sound was specifically designed to be more dense for tour players. Differentiated centre-vs-miss feedback is a real plus; the acoustic ages well as a quiet, dense profile.

Address profile reads as a deeper head with more face height and a more upright lie — confidence-inspiring for the slower-swinging buyer. Modern aesthetics with clean Mizuno colourway and visible carbon fiber sole. Slightly larger-feeling than the ST-Z stablemate. Industry-panel testers rated the design positively. Clean, premium tour-leaning silhouette for a draw-bias chassis.