As they are even stiffer than stiff flex, extra stiff bend very little during the golf swing, helping maintain a stable clubface through impact. This provides greater control, a lower ball flight and more consistent accuracy for fast swingers. Using the correct extra stiff flex shaft allows golfers to maximise distance while keeping their shots precise and predictable.

Yes, head designs and shaft flex are separate components. While you may typically expect to get low spinning heads in X stiff shafts as they compliment each other well with lowering spin. Many golfers out there prefer the benefits of additional forgiveness in their clubhead so they will use an X shaft with a max head. This is also a more common thing due to the advancements in adjustable loft sleeves lettin golfers change heads and shafts around freely.

Extra stiff hybrids don't automatically go further than stiff flex hybrids. What's important is matching the flex up to your swing speed. Golfers with very fast swings who will need extra stiff flex will hit an extra stiff flex hybrid further than a stiff one, but, a golfer who swings slightly slower may hit a stiff hybrid further than an extra stiff one.

Yes, you are able to get game improvement models in extra stiff flex. Many people believe if you need extra stiff flex you're automatically a good golfer, but in many cases there are golfers who may swing quickly but struggle to find the middle of the clubface.

Extra stiff irons have a reputation as being harder to hit than stiff or regular sets, and while this may be true for the majority of golfers, golfers who swing extremely quickly and will need extra stiff will find these shafts easier to hit than softer ones. It all depends on how quick you swing the club, and matching the haft flex up to work with your swing.

Extra stiff flex is suited to very fast swing speeds, if you swing a driver higher than 110mph then you will likely need extra stiff flex in all of your clubs including your wedges.

Yes, generally if your irons are extra stiff your wedges should match with them, wedge flex would be too much of a change and throw your swing tempo out the window.