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Srixon ZXi4 Irons Review – Plugged In Golf

March 30, 2025

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The Srixon ZXi4 irons are very forgiving. Immense distance potential thanks to strong lofts, fast ball speed, and low spin. Great look in the bag.

Introduction

A few weeks ago, I published my review of Srixon’s ZXi5 irons. If you missed it – you can catch up HERE – I was effusive in my praise, calling them the early leader for best game improvement iron of 2025. So where does that leave the Srixon ZXi4 irons – the model that Srixon actually acknowledges as game improvement? Let’s find out.

Looks

In the bag, you need a discerning eye to tell the Srixon ZXi4 irons from the ZXi5. On both sets, the branding is moderately sized and placed in the toe. They have a similar shape to the cavity, and they have the same excellent finish that mixes a few different silver tones. The one key difference is that the ZXi4 has a small black dot on the toe which indicates its hollow body design. All that to say, you’re going to catch a lot of people taking long looks if you have the ZXi4 irons in your bag.

At address, the ZXi4 irons are very good looking game improvement irons. The blade length is a little above average but not extreme. Similarly, the top line has a little heft but isn’t obese. Looking at the picture above, you’ll notice that the leading edge shifts from straight in the long irons to rounded in the scoring irons.

Above, you can see the Srixon ZXi4 next to the ZXi5 (right). If you want to see all the ZXi irons and their specs, Srixon has an outstanding chart HERE, but there are two things on the chart that don’t match what my eyes see. Srixon’s chart says that the top lines of the ZXi4, ZXi5, and ZXi7 are all the same, and that the offset specs are almost identical. I’ve looked at the ZXi4 and ZXi5 side by side, and I am 100% convinced the top line of the ZXi5 is thinner and that it has less offset.

There are probably ways for Srixon and me to both to be right, related to the measurement techniques and the impact of the club’s shape. In either case, this is all pretty deep in the weeds. I think there is a noticeable difference between the two models, but the transition is smooth enough that you could combo the two sets easily.

Sound & Feel

In the last few years, OEMs have made huge progress in giving hollow body irons a more solid feel, and the Srixon ZXi4 irons are a great example. On sound and feel alone, you’d have no idea these were hollow.

Starting with the short irons, the ZXi4 makes a dull, quiet “thud” at impact. Getting into the mid irons, the sound becomes a little more crisp. When you arrive at the 4I, there’s a full-throated “snap” that lets you know how fast these irons are.

The feel of the Srixon ZXi4 irons goes through a similar progression. In the short irons, the feel is solid and traditional. There’s no indication of extreme speed or tech. On the other end of the set, however, the feel trades some of that solid character for the sensation of the ball flying off the face. Though this set is built for forgiveness, I got a good sense of impact location through my hands.

Performance

After I tested the Srixon ZXi4 irons, I went back and looked at my review of their predecessor, the ZX4 Mk II irons . Much of what I said there matched what I wrote in my testing notes. It’s clear that Srixon approached the ZXi4 irons with a “don’t fix what isn’t broken” approach, and that’s really not a bad thing.

With these being the “true” game improvement set in the ZXi lineup, we’ll start with forgiveness. Thanks to their hollow body design, the Srixon ZXi4 irons deliver a bit more forgiveness than they look like they should. Their stock shot is high and straight, and they’re happy to produce that even when your swing is a bit off. The long irons won’t wring good results from terrible swings, but they’ll still give you more than you deserve.

Turning to ball speed, the Srixon ZXi4 irons are fast. I’m hesitant to say that they’re elite, but it’s possible I could have found that last bit of speed with a better fit shaft. I’ll say they’re borderline elite with the possibility of dropping the “borderline”. That speed comes from lofts that are the strongest in the ZXi family (between 1 and 2.5 degrees stronger than ZXi5) and the MainFrame technology in the club face.

Srixon’s iron chart rates the ZXi4 as “Long” in Distance (behind only the “Longest” ZXiU Utility Iron) thanks to the aforementioned ball speed and the fairly low spin. This set has progressive grooves – they’re wider in the long irons, deeper and closer-set in the short irons – but the result is low-average spin throughout the set. As always, I’ll remind you that this is not inherently good or bad, just something you need to consider with your fitter.

Everything I’ve said about the Srixon ZXi4 irons so far – good forgiveness, strong distance – is laudable, but it could be said about several irons in this category. What makes the ZXi4 unique is the Tour V.T. Sole. This design makes the moderately wide sole feel more like a players iron in the turf. If you’ve shied away from game improvement in the past because of sole width, you need to try these.

Finally, Srixon continues to be one of the industry leaders at pushing the idea of combo sets. Srixon suggests the ZXi4 as the long irons in combination with the ZXi5 short irons. I think this makes good sense for players that need a little more forgiveness and ball speed in their long irons, but I would always recommend that you build your combo set with a fitter to get every specification dialed in correctly.

Conclusion

The Srixon ZXi4 irons could easily wither in comparison to their stellar line mates, but they carve out their own space with strong forgiveness and the fastest ball speed in the group. If you want a beautiful game improvement iron with loads of distance potential, make this a part of your next fitting.