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But what exactly is it and how does it affect your golf? The latest buzz word in golf equipment manufacturing is "Moment of Inertia" or MOI for short.

What is MOI?

MOI can be described as a measure the resistance an object has to turning about its axis, very simply.

What does MOI mean when applied to a golf club?

There are several factors relating to golf clubs and MOI.

1) MOI of the whole club

A club with a high MOI takes more effort to swing, similarly. A club with a high Swing Weight feels heavier to swing. This is akin to the Swing Weight scale which was developed as an easy way to get all clubs in a set to feel the same when you swing them. A measurement of the effort required to swing the club. Each club will have an overall MOI i.e.

2) MOI of the club head

The higher the chances of a straight shot, the less it twists. The higher the MOI the less the club head will twist. The club head itself has a MOI related to the effort required to twist it about its centre of gravity at impact with the ball.

Not Just for Drivers!

Leading to more consistent putts, allowing it to resist twisting when you strike the ball, for instance perimeter weighting in a putter increases its MOI. However all clubs have a MOI. And even then it is mostly referring to drivers, in marketing terms you will only really ever hear about the MOI of a club head.

Why is MOI important to your game?

The better scores you will produce, the more you can hit straight shots. And therefore increase the probability of straight hits, but will reduce the chance of the club head twisting, a higher MOI will not give you more distance with your driver.