ST-X 220

The chassis uses a Sweet Area metric (toe-heel and top-down MOI ellipse) measured 30% larger than the predecessor, with manufacturer commentary positioning it among market leaders for vertical MOI. A 20g heel-biased back weight pushes mass low/back and provides MOI boost while supporting draw bias. Multi-thickness CORTECH face thins the perimeter to make the sweet spot and surrounding area hotter and more forgiving. Top-quartile 2022 forgiveness for a draw-biased chassis.

Reviewer testing measured an average ball speed of 145 mph at 102 mph swing speed using the 10.5° head, with average launch angle 14° and average spin rate 2,747 rpm — solid mid-pack 2022 numbers. The chassis produces higher launch with mid-to-high spin for max distance at moderate swing speeds. Multi-thickness CORTECH face improves ball speeds on shots low on the clubface — the chassis recovers yards on common mis-strikes for the target slower-swing buyer.

Built-in heel-biased draw configuration with single fixed 20g back/heel weight constrains shape-tuning hardware. Hosel offers 4° of loft adjustability (±2°) including DRAW positions. The chassis is structurally a one-way head — built for a draw spin to reduce a slice. Reviewer testing noted the head presents a wide square face that doesn't telegraph the bias visually. Limited workability outside the engineered draw shape; accomplished ball-strikers will still impose shape via setup/swing.

Reviewer testing called the head "outstanding" on feel, with the chassis delivering vibration patterns elite players associate with a 'solid' feel following Harmonic Impact Research. The Beta Ti face plus complex carbon construction deliver both potent ball speeds and a dense, satisfying sensation at impact. Strategically placed internal sound ribs tune the impact sound to the appropriate frequency and sound pressure — the signature forged-iron tactile DNA refined further. Top-tier 2022 feel.

Acoustic profile reads quiet and medium in pitch on centred strikes — a fine complement to the feel. Mishits are louder, which adds to their jarring quality. Mizuno's Harmonic Impact Research has reduced vibrations to enhance sound and feel, with pitch, volume, and tone tuned in units of tens of hertz. Premium quiet character that differentiates centre from miss; ages well in the brand's acoustic lineage.

Address profile reads nothing like the typical club golfer's perception of a draw driver — a big wide head that has a lovely square face, confidence-inspiring without telegraphing the heel bias. The 460cc shape sits slightly lower to the ground for higher launch. Modern aesthetics with carbon sole panels and clean colourway. Industry-panel testers reviewed favorably.