Mizuno Pro S-1 Irons

Mizuno Pro S-1 Irons – Pure Blades. Pure Control. Pure Mizuno Feel.

The Mizuno Pro S-1 Irons are unapologetically traditional—in the best way possible.

These are true muscle-back blades, built for golfers who care about precision, shot-shaping, and feedback more than anything else. Each head is forged from a single billet of 1025E Pure Select Mild Carbon Steel, finished with a thin copper underlay, and crafted using Mizuno’s legendary Grain Flow Forged HD process in Hiroshima, Japan.

Translation?
That buttery, soft, “you know it when you feel it” impact that Mizuno is famous for.

But the S-1 isn’t just a throwback. Mizuno’s tour staff helped refine the shaping, toe profile, sole design, and even the internal mass placement to make these blades more stable, more consistent, and more playable than traditional muscle backs of the past.

Classic look. Modern precision.

Key Features

• Single-piece forged muscle-back blade for ultimate accuracy, workability, and control

• Grain Flow Forged HD in Hiroshima, Japan from 1025E Pure Select Mild Carbon Steel with copper underlay

• More squared-off shape and toe based on tour player feedback

• Channel Back Design subtly repositions mass vertically for higher MOI and more consistent launch

• Produces a firmer, more responsive impact sensation without losing Mizuno’s signature softness

• Tour-tested sole design with flatter camber, sharpened leading edge, and added bounce

• Excellent turf interaction for both shallow sweepers and aggressive ball-strikers

• Nearly identical specs to the Pro S-3 for easy set blending

• Stock shaft: KBS TOUR steel

• Stock grip: Golf Pride Tour Velvet

• Authorized Mizuno retailer product

Why We Love The Mizuno Pro S-1 Irons

Because they tell the truth.

Every strike. Every miss. Every pure shot.

The S-1 gives you exactly what you put into it—and when you catch one flush, it’s as good as golf gets. That soft-but-solid feel, the tight ball flight, the total control over trajectory… it’s addicting.

What really separates the S-1 from old-school blades is how stable they feel. The Channel Back design quietly does its job, keeping launch and distance more consistent than you’d expect from a traditional muscle back.

They’re demanding, sure.
But incredibly rewarding.

If you’re the type of golfer who values craftsmanship, feedback, and control above all else… these are special.

Ideal Player Profile

The Pro S-1 irons are best suited for golfers who:

• Are confident ball strikers

• Prefer muscle-back blades

• Want maximum workability and trajectory control

• Value feel and feedback more than forgiveness

• Play low-handicap or competitive golf

If you like shaping shots, flighting wedges down, and controlling spin into tight pins, this is your kind of iron.

Stock Shaft: KBS TOUR

Mid launch • Mid spin
A tour-proven steel shaft with a smooth feel and stable profile. Excellent for consistent tempo players who want control, feedback, and predictable ball flight throughout the set.

Stock Specifications

Stock set: 4–PW

Get Fit for Maximum Performance at Austad’s

Blades like the Mizuno Pro S-1 demand precision—and the right fit makes all the difference.

At Austad’s, we don’t just sell clubs… we dial them in.

We’re proud to be a Top 100 Mizuno Custom Fitter, with professional fitting studios and master fitters who fine-tune every detail, including:

• Shaft model & flex

• Lie angle & length

• Grip size & build style

• Set makeup and gapping

When your specs match your swing, you’ll see tighter dispersion, better distance control, and more confidence standing over every shot.

If you’re investing in a true muscle-back iron, a custom fitting isn’t optional—it’s the secret weapon. Learn about our award-winning custom fitting services >>