The Callaway S2S TRI-HOT series aims to enhance putting feel with a new shaft design, upgraded insert, and optimized weighting.
Callaway’s new S2S TRI-HOT putter series is designed to revolutionize the putting experience—not with gimmicks, but with smart engineering. The shaft is mounted directly to the top edge of the putter head, eliminating visible shaft lean and forced address positions. This setup could appeal to players who have struggled with zero torque putters in the past.
Callaway puts weight where it matters
Inside the putter head, Callaway has made several structural changes. The design combines aluminum, steel, and over 140 grams of tungsten, aiming to concentrate more weight high in the clubhead. According to the company, more than 80% of the mass is located just beneath the top line, helping to stabilize the stroke and improve balance and control.
New insert for consistent roll
The face insert also gets a major upgrade. The Ai-DUAL insert features two urethane layers—soft on the outside, firmer inside—developed using artificial intelligence. The goal is to maintain ball speed on off-center hits. The Forward Roll Design, with grooves angled at 19 degrees, is engineered to enhance forward spin across the entire face.
Grip, shaft, and setup reimagined
Tour feedback played a key role in the redesign of the grip, resulting in a Pistol-Plus model with defined edges for better face angle awareness. The SL 120 shaft features a black PVD finish and is both stiffer and heavier than previous versions, also based on pro insights. For those who prefer a longer and heavier setup, the Jailbird Cruiser model offers a 38-inch shaft, extended 17-inch grip, and a heavier head.