Zero torque putters were one of the hottest trends in 2025, so much so that all of the major manufacturers jumped into the fray with versions of their own. The issue? The need for a putting stroke with limited or no arc to make the putters effective meant a lot of golfers spent considerable funds trying them out, only to determine they weren’t right for their particular stroke on the greens. With S2S TRI-HOT SB, Callaway is trying to rework what a zero torque putter feels and looks like. By utilizing multi-materials in construction, Callaway’s engineers moved the center of gravity forward, allowing for the shaft to enter the head of the topline. This concept creates a natural setup without one of the keys to traditional zero torque putters, the need for shaft lean that drives many golfers away from the concept.
“We want to introduce the line extension that further expands zero torque to more people,” says Callaway’s Jacob Davidson, Vice-President of Product Strategy. “The zero torque category is really hot and growing and expanding. But the innovation of zero torque is still in the early stages of maturity.”
Key technologies
Single Bend
SB tech shifts the shaft towards the heel, making the putters look more familiar to golfers at address. The result is a zero-torque putter without the center shafted design and one that many golfers will be more comfortable with.
No shaft lean
The shaft in the putter is now on the topline, eliminating the forward press and moving the shaft closer to the face than what was typical in earlier versions of zero torque putters. For many people, this creates a much more comfortable setup.
Multi-material construction
Aluminum, steel and tungsten are all key to the designs in the line, allowing 80 percent of the weight in the head to be moved under the topline and allowing the center of gravity to be moved forward.
AI dual insert
Artificial intelligence, a longtime buzzword for Callaway, was used to design the dual-layer urethane insert that has a soft outer layer and a firm inner layer. The concept enhances consistent ball and forward roll on the putt. This is the same insert found in previous generations with two different levels of firmness of urethane built in.
FRD Groove Design
A new groove design that is deeper and more aggressive than past models, this works in conjunction with the dual layer design to improve roll.
Pistol Plus Grip
Past zero torque putters often needed specific grips, but that isn’t the case with the S2S Tri-Hot SB. Callaway looked at the most popular grips on tour and landed on a mid-sized pistol grip with crisp edges.
Shaft SL 120
Developed with tour feedback, this is a heavier shaft than the SL 90 found in previous generations.
Is it for me?
This doesn’t look like the zero torque putters of the past, so much so that Callaway is planning on putting stickers on the putters at retail to highlight they are, in fact, zero torque. There are three shapes, the crescent-shape Rossie, a No. 7 Cruiser and Callaway’s Jailbird shape. But the goal here is to open zero torque putters up to a wider audience that couldn’t get comfortable with previous versions, largely because of the center shaft.