Over a four-year development process, including blanket usage by Mizuno’s contracted professionals, Mizuno has lifted its metal woods from the shadow of its iconic irons. The ST-190 driver initiated Mizuno’s ST (Speed Technology) project, the ST-200 then added the Beta Ti face and was Mizuno’s first “Tour Ready” driver. The ST-Z and ST-X then added versatility with the option of two models. The ST220 Series represented a big shift in stability and ball speeds from off-center strikes.
After multiple iterative developments for stability, sound and spin, Mizuno has identified the missing piece to its ball speed equation with the CORTECH Chamber – in its ST-230 Series due for 2023 release. The CORTECH Chamber encases a stainless-steel weight with elastomeric TPU, taking stress from the clubface and creating an additional source of energy. At the same time, it locates weight closer to the clubface to reduce spin rates, while contributing to a more solid, powerful sensation at impact.



















