I recently had the chance to visit the Titleist Performance Institute (TPI) in Oceanside, Calif., to get fit for the new T-Series irons — and I walked away with a setup that might be the most dialed-in iron set I’ve ever owned.
Now, I get it: Most golfers won’t get the chance to walk through the doors at TPI. But the lessons I took from that experience apply to anyone looking to get more performance, consistency and confidence from their irons. The credit for my results goes to Joey Saewitz, a TPI Master Fitter, who walked me through the full Titleist fitting process — an experience that separates itself by how laser-focused it is on optimizing what Titleist calls the “3 D’s” of fitting: Distance control, Dispersion, and Descent angle.
A fitting process built around you
Here’s what’s cool about how Titleist does things at TPI: They don’t just ask you what you want to hit; they show you what you should be hitting based on real, player-focused benchmarks.
Every iron category — short-irons, mid-irons and long-irons — is tested independently, and each club has to pass a series of filters: launch window, spin range, peak height, descent angle and ball-speed gaps.
The goal? Roughly 5 mph of ball speed separation between clubs, consistent apex heights and descent angles that give you green-holding power across the entire set.
It’s not about chasing your longest 7-iron. It’s about building a set that performs from top to bottom — and consistently and predictably.
My starting point: A blended setup that worked (kind of)
I walked into the session with a pretty solid setup: T100 6-PW, a T150 5-iron bent weak to blend lofts and a T200 4-iron, also weakened by 2 degrees to hit my launch and spin numbers. It worked. But Joey identified something better.
After testing the entire new T-Series lineup — T100, T150, T250 and T350 — we landed on something I didn’t expect: a full set of T150s from 4-PW.
Titleist 2025 T150 Custom Irons
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Why the new T150s won me over
The T150 is billed as the faster, slightly more forgiving sibling of the T100. And while they share a lot of DNA — like variable face thickness, muscle channel in the long irons and progressive groove design — there’s more firepower baked into the T150.
What surprised me was how close they launched to my previous T100s, but with noticeably more speed, tighter dispersion and better forgiveness on small misses. That’s the kind of difference you see immediately, especially on longer approach shots.
To fine-tune the spin and height, we weakened the lofts by 1 degree throughout the set. That gave me exactly what I needed: a touch more spin, higher apex and the kind of descent angles that stop the ball quickly on the green, even when those putting surfaces are baked and as hard as tabletops (as they are during the summer months here in Arizona).
The 3 D’s: Why every golfer should care
Everything at TPI ties back to optimizing the 3 D’s. This isn’t just a Tour-level detail; these numbers should matter to every golfer:
Distance Control: You need to know exactly how far each iron carries. Gaps of 10-12 yards with consistent ball speed are ideal.
Dispersion: Mis-hits are inevitable. But the right head and shaft combo can minimize the damage and keep your grouping tight. (Golf is a game of misses.)
Descent Angle: If your irons aren’t coming in steep enough, you’re not stopping the ball on the green, especially with long irons.
That’s the biggest takeaway: no matter how premium the tech is, performance only shows up when the build fits your swing.
Titleist 2025 T-Series irons | 7 things to know
The New T-Series lineup: Built for blending
Titleist made it clear with this generation: each model has a purpose, and they’re designed to mix and match based on what your game needs.
- T100: Compact, forged feel. The most precise and workable option.
- T150: Faster and more forgiving but still Tour-inspired. (My club of choice)
- T250: A total redesign with true player’s distance performance.
- T350: Game-improvement forgiveness with serious ball speed.
Each iron looks clean and cohesive in the bag, making blended sets more accessible than ever. That said, blending isn’t guessing. You still need to test each head, loft to loft, to find the right transition points. The last thing you need is a 20-yard gap between your 7-iron and 8-iron. Test. Get fit.
What I learned — and what you should do
My trip to TPI was an incredible experience. But the real value wasn’t just the irons I walked away with — it was the clarity on what a proper fitting can do.
The technology in the new T-Series is seriously impressive, but the best results don’t come from just the clubs themselves. They come from building a set that launches right, spins right, lands soft and carries the yardages you need.
And here’s the really good news: You don’t need to go to Oceanside to get that experience.
If you’re ready to upgrade your iron game or just want to know what you’re leaving on the table, book a fitting at True Spec Golf. Their fitters work with the full T-Series lineup and use the same data-driven philosophy to match players with their ideal build.
