I questioned the fitter when he put me in stiff shafts in my irons. I play R flex in everything else, but he assured me that S was the right call for my irons based upon what he was seeing on the launch monitor. It surprised me, but I went with his call.I actually questioned the fitter when they said I needed a stiff shaft in my driver. I was sure I’d need a regular. I couldn’t give a toss what the label says in my golf shaft, or anywhere else. All that matters is that number at the end of 18 holes.