Korean Hidden Technology autoFlex Joy365 Driver, Fairway & Hybrid Shafts

By Russ Ryden, Fit2Score, A Dallas Fort Worth Club Fitter & Builder
The Highlands Performance Golf Center, Carrollton Texas 
Golf Digest Certified America’s 100 Best Club Fitter

Korean Hidden Technology AutoFlex Driver shafts came to the US market several years ago. I saw one in 2021. They caused a sensation with a $790 price point. They were very light weight and started a trend for light weight driver shafts. Ultimately the recreational US golfer was not ready for light weight shafts at that price point.
I met with Korean Hidden Technology at the PGA 2025 merchandise show and shot an interview in their booth. It is on the list of videos that need to be published. They followed up with a shipment of review samples of every SKU they make. I don’t see much difference between the Joy365 and the original autoFlex shafts. The autoFlex website tells us the Joy is made with updated prepreg. the measured differences are subtle. Without hitting them I cannot comment on feel.