Mizuno Pro S1 Irons Review: My Favorite Mizuno Pure Player Irons

This is our Mizuno Pro S1 irons review.

I’m an avid golfer, 6ish handicap on my way to a 2 (been a 5.6) and frequent tester of golf clubs and equipment since 2015.

In this review of Mizuno Pro S1 irons, I discuss my experience with the clubs, their unique features and benefits, customer reviews, and potential alternatives. 

Mizuno Pro S1 Specs (Set Tested)

Club	Loft	Lie	Length
4	24*	60.5*	38.75″
5	27*	61*	38.25″
6	30*	61.5*	37.75″
7	34*	62*	37.25″
8	38*	62.5*	36.75″
9	42*	63*	36.25″
PW	46*	63.5*	35.75″

How we tested:

Range sessions – 2
Rounds of golf – 2
Launch Monitor – 1

7-Iron Launch Monitor Data (Average #s)

Note: Peak height for this launch monitor test is indicative of my swing at the time of testing, not the club.

These irons went plenty high during my rounds.

Club	Club Speed	Ball Speed	Carry Distance (yds)	Peak Height (ft)
7-iron	83	116	167	49

What Sets The Mizuno Pro S1s Apart

The Pro S1 is a pure muscle back iron forged from a single billet of 1025E carbon steel using Mizuno’s Grain Flow Forged HD process. The company highlights three core design elements:

The S-1 sole features a flatter camber profile, sharpened leading edge, and increased bounce angle. Mizuno states this improves turf interaction by reducing digging and allowing for aggressive angles of attack, particularly beneficial for shallower swings.

The Channel Back Design repositions mass behind the face to achieve a more stable vertical center of gravity, which Mizuno claims delivers consistent launch conditions and a firmer, tour-preferred feel.

A copper underlay is included to refine vibration patterns and optimize the feedback at impact—part of Mizuno’s broader claim about the forged construction delivering soft, responsive feel.

Aesthetically, the irons feature a soft white satin nickel chrome finish that Mizuno says reduces glare at address.

How Do Pro S1 Irons Perform?

Category	Grade
Looks	5
Sound/Feel	5
Distance	5
Forgiveness	5
Flight/Playability	5
Value	4

Bag Appeal: (5) Gorgeous – simple – elegant. I love the brushed metal finish. Head shape is perfect. Heads are compact with a thin topline and sole, but not intimidating.

The best looking Mizunos I’ve tested.

Sound/ Feel: (5) Soft and solid. As good as the JPX models – so, the best in the game.

Forgiveness: (5) More than you’d expect. More than minor mishits are suitably punished. Never harsh.

Distance: (5) As long as any in the pure player iron category.

Flight / Launch: (5) They can go high or low or anything in between if your skills allow it. Take off distance and shape them too.

Wallet Damage: (4) ~$215/club. Expensive for Mizuno irons.

My Experience with Pro S1s

I thoroughly, thoroughly, thoroughly enjoyed playing the S1s.

Funny, because I didn’t play particularly well with them. (That’s on me)

Yes, I hit the odd good shot with them. But what stood out from the very first swing on the very first hole was how solid and soft they feel.

I expect Mizunos to have world class sound and feel. But, their blades typically lag behind their JPX models in this regard.

Not so with the Pro S1 irons.

That swing and that contact took me back immediately to the first time I hit the JPX 921 Forged Irons.

Butter soft, yet solid. The ball launching high at my target.

They won me for life.

Back to the S1s. These are pure player irons, not player performance irons like the JPX Forged models.

But, I think they have maybe a little more pop than I expected. This may be owed to them also having a little more forgiveness than I expected too.

So, you have to bring more game and a more disciplined swing.

I really want to try the Pro S1s again when my game is in better shape.

Who Should Play Mizuno Pro S1 Irons?

Serious players with serious ball striking, say 6ish handicaps on down.

Low handicaps: (Oh, Yes) Can’t imagine you wouldn’t love these.
Mid handicaps: (No) Look at the JPX Hot Metal line.
High handicaps: (NoNoNo) See above.

Our Best Alternatives to Mizuno Pro S1 Irons

Taylormade P-7CB irons – Awesome clubs that play very similar to the Pro S1s. Don’t sound and feel as good, but that’s a high bar to meet.

Titleist 620 CB irons – I’ve been recommending the 620 CBs for years now. Very under the radar great irons. Similar playing characteristics Mizuno Pro S1s. Also with very good sound and feel. Also, gorgeous.

We’ve got a whole big list of reviews of low handicap irons if you’d like more options.

Check out more low handicap irons from Mizuno.

Final Verdict

Mizuno Pro S1s are exceptional irons that do everything you’d expect with a little extra distance and more forgiveness.

• Gorgeous compact clubheads.
• Play any shot your skill allows.
• Consistent distance and dispersion.

Plus, they set the standard in sound and feel.

They’re definitely worth a look if you’re in the market for premium player irons and don’t mind spending a little extra for them.

My #1 suggestion is to try to get your hands on them before you buy.  

Thanks for checking out our Mizuno Pro S1 irons revieww.

Let us know how they work for you.