Mizuno has officially expanded its Mizuno Pro lineup with two new models—the M-13 and M-15—creating what the company calls the Modern Series. These irons join the existing Signature Series (S-1 muscle back and S-3 cavity back) to give players a broader range of options while maintaining the forged feel and performance Mizuno is known for.
The Modern Series is positioned as the more forgiving, speed-focused offering compared to the traditional Signature Series, though both maintain the compact, tour-inspired shaping that better players expect from the Mizuno Pro line.
My Background with Mizuno
I played the JPX-900 irons for over five years and generally loved them. They provided control without being too unforgiving, and they felt great. So when Mizuno sent over the new M-13 and M-15 irons to test, I was curious to see how these more player-focused offerings would compare.
My first impression? These are definitely more player-focused than the JPX series, but they aren’t dramatically less forgiving—only slightly. The best part is how they look. They look like true players irons. Looking down at them, they honestly look too advanced for me. But hitting them, especially the M-15 series, feels really good.
You still get penalized for dramatic mishits, but they were more forgiving than I expected, and the feel is wonderful when you hit one pure.
Mizuno Pro M-13: The Players Iron with Modern Tech
The M-13 succeeds the Mizuno Pro 243 and is designed for accomplished ball strikers who want a classic look with modern performance enhancements. The key to this iron is how it uses three distinct constructions throughout the set while maintaining a consistent appearance from 4-iron to gap wedge.
Long Irons (4-5): These feature a Pocket Cavity Grain Flow Forged construction combining Chromoly 4120 with 431 stainless steel. The result is Mizuno’s thinnest-ever Contour Ellipse Face at just 1.37mm thick—approximately 35% thinner than the 243. This construction is all about unlocking ball speed and distance in the clubs where players need it most.
Mid Irons (6-8): A Micro-Slot Grain Flow Forged construction with the face 0.3mm thinner than its predecessor delivers controlled speed gains. The design focuses on increasing flex in the lower portion of the face where most shots are struck, maintaining mid-to-high COR performance.
Short Irons (9-GW): Pure 1025 Elite single-piece forgings prioritize precision, control, and that signature Mizuno soft impact feel that’s defined their scoring clubs for decades.
The M-13 also features Mizuno’s Harmonic Impact Technology paired with a copper underlay and full-cavity ABS badge to fine-tune sound and vibration. A Triple Cut Sole with sharper leading edges and beveled trailing relief ensures clean turf interaction from any lie. The Nickel Chrome Satin Brush finish reduces glare while delivering a premium aesthetic.
Price: $215 per iron
Availability: February 5, 2026
Mizuno Pro M-15: Forgiveness Meets Performance
The M-15 replaces the Mizuno Pro 245 and offers a fully integrated progression of performance from long iron through wedge. This is the more forgiving option in the Modern Series, designed for players who want higher launch and more stability without sacrificing the look and feel of a better-player iron.
Long and Mid Irons (4-8): The core technology here is the Contoured Ellipse Face—Mizuno’s latest development of their CORTECH technology. These hollow-body irons feature a multi-thickness forged construction that optimizes ball speed and consistency while preserving responsive feel. The long irons (4-7) include 51g of strategically suspended tungsten in the head, dropping to 50.3g in the mid irons, helping produce straighter, more forgiving ball flights.
The construction pairs a Grain Flow Forged 4135+ Chromoly face and neck with a stainless steel back piece for additional rebound and face flex.
Short Irons (9-GW): These transition to a partial hollow 1025E Grain Flow Forged HD body with a stainless back, emphasizing control, precision, and shot-making ability in the scoring clubs.
Like the M-13, the M-15 features refined sole geometry with added bounce for cleaner turf interaction, Harmonic Impact Technology with copper underlay for improved sound and feel, and a Premium Nickel Chrome Satin finish.
Price: $215 per iron
Availability: February 5, 2026
New Mizuno Pro Fli-Hi Utility Iron
Rounding out the launch, Mizuno has also updated its Fli-Hi utility iron for players who want an alternative to long irons. The new Fli-Hi launches higher than the previous version thanks to a wide sole, deep center of gravity, and thin face construction.
The updated design uses 26 grams of tungsten—three more than its predecessor—to drive the CG down, while a contour ellipse L-face made from high-strength, heat-treated nickel chromoly steel delivers plenty of ball speed. Available in 2-, 3-, and 4-iron options (16.5°, 19°, 21.5°).
My favorite of this entire lineup is actually the new Fli-Hi utility 4-iron. It’s really light, and from the moment I picked it up, it exuded confidence. It stays true to its “Fli Hi” name with a very high ball flight, but it goes straight and is easy to hit. This club just works.
Price: $270
Availability: February 5, 2026
The Modern Series Philosophy
With the introduction of the M-13 and M-15, Mizuno now offers a clearer structure within the Mizuno Pro lineup. The Signature Series continues the company’s most traditional tour iron lineage, while the Modern Series introduces next-generation solutions in speed, stability, and launch control—all within compact profiles that elite players trust.
The ability to seamlessly blend models from both series gives players unprecedented freedom to match head design to their specific needs throughout the bag, without ever compromising the forged identity that defines Mizuno.
Final Thoughts on the New Modern Mizuno Pro Irons
Overall, I’m excited to spend more time with this full lineup, as Mizuno continues to impress me with every new launch. I’ve had the Mizuno Pro wedges in my bag for the last six months and love them, so the opportunity to build out a full Mizuno Pro setup is genuinely appealing.
These irons deliver that classic Mizuno feel and look without demanding tour-level ball striking. If you’ve been curious about moving into a more player-focused iron but weren’t sure you were ready, the M-15 in particular might be the bridge you’ve been looking for.
