KHT is a variable-thickness carbon layup that creates an elastic wall in the shaft — a proprietary internal construction that distributes stress across the entire shaft wall rather than relying on a rigid spine or core. The result is a shaft that flexes deeply on the downswing and snaps back to neutral at impact with maximum energy return. It's not just lighter. It's smarter — a shaft that adapts to your swing, breaking the limits of conventional shaft design.
Every golf shaft on the market solves the same problem: how to keep the clubhead stable at impact while allowing the shaft to store and release energy during the swing. KHT solves it differently.
Conventional shafts use a rigid spine or a stiff core running the length of the shaft to resist twisting. This works, but it adds weight and limits how deeply the shaft can flex. The golfer has to find a shaft that matches their exact swing characteristics — and when they don't, energy transfer suffers.
KHT eliminates the rigid spine entirely. Instead, a variable-thickness carbon layup creates what Dumina calls an "elastic wall" — a shaft wall that is thicker and stronger in specific zones and thinner in others, tuned by computer modeling over 10+ years of R&D. When the shaft is loaded during the downswing, the elastic wall distributes stresses across the entire circumference rather than concentrating them along a single spine.
This means the shaft can flex deeper than a conventional shaft at the same swing speed, storing more energy. At impact, the elastic wall snaps back to neutral instantly, releasing that stored energy into the clubhead. The result: a shaft that feels soft and lively in the hands but produces ball speeds that match or exceed stiffer alternatives.
Rigid spine or core resists twisting. Limits flex depth. Adds weight. Requires exact flex match to the golfer's swing.
Stress distributed across the entire shaft wall. Flexes deeper for more energy storage. Lighter by 20-30g. Self-adapts to your tempo.
The "Auto" in AutoFlex and AutoPower reflects this core philosophy: a shaft that automatically adapts to your swing characteristics rather than forcing you to adjust to it.
Premium carbon fiber prepreg sourced from Japan and Korea. Higher modulus means more stiffness per gram — the foundation of the weight savings. T1100-grade materials used in pro-level models.
Carbon sheets are oriented in a computer-optimized pattern — varying angles, overlaps, and layer counts — that creates the elastic wall. The thickness changes across the shaft circumference based on 10+ years of R&D data. This is the "Hidden" part.
Every shaft is tested on a frequency analyzer and must fall within ±2 CPM of its target. The industry standard is ±10 CPM. 100% inspection — every shaft, not samples. Any two SF505s in the world play within 4 CPM.
The elastic wall does not just store energy. It self-tunes to your tempo and transition.
When you swing, the shaft loads according to the force you apply — not according to a predetermined flex profile. A smooth tempo at 85 mph loads the elastic wall gently, producing a deep, gradual kick. An aggressive transition at 115 mph loads it sharply, engaging the stiffer zones of the wall and producing a faster, more controlled release.
The same shaft, two different swings. Two different energy profiles. One shaft that adapts to both.
Where conventional shafts require the golfer to find the right flex, weight, and bend profile through trial and error, KHT's elastic energy return self-adapts — making it a smarter shaft that fits your swing, not the other way around. This is what the "Auto" in AutoFlex and AutoPower stands for: automatic adaptation. Breaking the limits of one-size-fits-all shaft design.
The SF Series covers 65-125 mph in five flexes — a range that would require 10-15 SKUs from conventional manufacturers.
Conventional shaft design follows a simple rule: lighter means less stable. More stable means heavier. The trade-off is unavoidable — unless you change the internal architecture.
KHT breaks that trade-off by reallocating mass and stiffness to where they matter most:
The result: a shaft that is up to 30 grams lighter, releases clubhead speed at the moment of impact, and delivers tighter dispersion than shafts 20-30 grams heavier. The weight savings alone can translate to 3-5 mph of additional clubhead speed for the same effort.
14-time PGA Tour winner put the AutoFlex SF505XX in play at the 2021 Farmers Insurance Open — the first PGA Tour player to compete with KHT. He reported ball speeds matching or exceeding his previous setup at significantly lighter overall weight.
LPGA player currently gaming the AutoPower Snipe with KHT technology. Multiple wins in KLPGA and LPGA events. Her success has driven adoption of KHT across the women's professional tours.
2016 PGA Championship winner. Switched to AutoFlex SF505XX and led the RBC Heritage through 36 holes, reporting ball speed jumping into the 180s. KHT is not just for slow swingers — it holds up at elite speed.
Visit an authorized Dumina fitter to feel the KHT difference for yourself. Or browse the full lineup of KHT-powered shafts.