Honestly, if you've ever watched Si Woo Kim play, you know the vibe. One minute he’s hitting a laser-like iron to three feet, and the next, he’s snapping a putter over his knee at Augusta. He’s pure theater. But lately, the drama has been less about his temperament and more about his tools. Specifically, what’s going on with the Si Woo Kim WITB (What’s In The Bag) as we roll into the 2026 PGA Tour season.
There was that whole LIV Golf rumor mill churning back in late 2025. People were convinced he was heading to the "Korean Golf Club" (formerly Iron Heads). Then, he basically shut down the internet with a single Instagram post of him holding the Sony Open trophy, saying he wasn't going anywhere. Callaway even leaned into it with a Wolf of Wall Street meme. It was legendary. Now that he’s firmly committed to the PGA Tour, let’s look at the gear he’s actually using to compete.
The Big Stick: Transitioning to the Quantum
For a long time, Kim was the poster child for the Paradym Ai Smoke Triple Diamond. It’s a low-spin beast. But as of the Australian Open late last year and moving into the 2026 Sony Open, he has been spotted with the Callaway Quantum Triple Diamond. This is the 2026 flagship. It’s got a slightly different profile that seems to favor his aggressive transition at the top.
He’s sticking with a setup that works for his speed.
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- Driver: Callaway Quantum Triple Diamond (9 degrees)
- Shaft: Fujikura Ventus Black 6 X
The Ventus Black is basically the industry standard for guys who swing it hard and don't want the clubhead twisting. It’s stiff. Really stiff. Kim needs that stability because his move is quick. He isn't trying to guide the ball; he’s trying to kill it.
The Mini Driver Experiment
One of the weirder things in his bag recently has been the presence of a mini driver. Specifically, the Callaway Ai Smoke Ti 340. He’s been using it as a "3-wood on steroids." It’s 11.5 degrees and has a Fujikura Ventus Black 7 X shaft. Why? Because on tight par 4s, a standard driver is too much and a 3-wood might not be enough. The mini driver gives him that "fairway finder" confidence without sacrificing 40 yards.
Those Gorgeous Blades
If you're a gear nerd, Kim’s irons are the main event. He is a ball-striking purist. While most of the tour is moving toward high-tech "players distance" irons, Si Woo stays old school with muscle-back blades.
He’s currently gaming a split set, which is pretty common now.
- 4-Iron: Callaway X Forged (KBS Tour V 125 X)
- 5-PW: Callaway Apex MB '26 (KBS Tour V 125 X)
The 2026 Apex MBs have some subtle badging changes, but they remain a true blade. The KBS Tour V 125 X shafts are an interesting choice. They are a bit lighter than the standard Dynamic Gold X100s you see everywhere, which helps him keep the flight a bit more piercing in the wind—something he deals with a lot in places like Hawaii and Florida.
The Short Game and the "Broomstick" Saga
We have to talk about the putter. It’s the most volatile club in his bag. Kim has bounced back and forth between a standard length and the broomstick more times than I can count. Right now, he’s settled back into the Odyssey 2-Ball Ten Tour Broomstick.
It’s an ugly duckling of a club, but it saved his career on the greens. He anchors it (well, legally, he doesn't anchor to the chest, but it’s that long-arm style) and it just takes the "yips" out of the equation.
For wedges, he's transitioned into the Callaway Opus line.
- 48° (Pitching Wedge replacement/Gap)
- 52°
- 60° (T-Grind)
The 60-degree is the money maker. He uses the "T-Grind," which has a very thin sole. This allows him to open the face completely flat on tight lies without the leading edge digging in. If you try to hit this club and you aren't a pro, you will probably blade it across the green. Kim, however, makes it look like magic.
Why the Setup Matters
What’s fascinating about the Si Woo Kim WITB is the lack of "fluff." He doesn't carry many hybrids. He doesn't like the "left" miss that hybrids sometimes encourage. Instead, he sticks to a Callaway Rogue ST LS 5-wood (18 degrees) which he has had in the bag for years. It’s a "comfort" club. Even though he’s a Callaway staffer, they let him keep that older head because he trusts the launch window.
He plays the Callaway Chrome Tour X ball. It’s the higher-spin version of the Chrome line. Since he plays blades and has a relatively flat launch angle, he needs that extra spin to keep the ball in the air and make it stop on firm greens.
Actionable Insights for Your Own Bag
You don't have to be a PGA Tour pro to learn from Kim's setup.
- Don't fear the "old" woods: If you have a 5-wood you love, don't swap it just because a new model came out. Trust is more important than 2 extra yards.
- The Mini Driver is real: If you struggle with your driver, a 13-degree mini driver is way easier to hit and much more forgiving than a standard 3-wood.
- Shaft weight is key: Kim uses 125g iron shafts. Most amateurs use 95-105g. If you're losing balls to the right, your shafts might be too heavy; if you're hooking everything, they might be too light.
Kim’s bag is a mix of cutting-edge 2026 tech and trusted favorites from years ago. It’s a setup designed for a guy who wants to feel every vibration through the grip and control every yard of the flight. For the 2026 season, expect that Quantum driver to be the difference maker in his hunt for another trophy.