The grips that golfers use are as varied as hibiscus in Sri Lanka, but elite golfers all obey one rule, they grip the club in the fingers.

If you are able to close your fingers without discomfort, the grips
fitted to your clubs should enable you to close your fingers around
the club comfortably and in a relaxed fashion.

The size of the grip is only a reference point to begin the grip fitting process. Don’t fall for the ridiculous myth that grips which are too thick cause a slice. Tension in the hands is a sure way to start slicing your ball.
If the hands are relaxed the hands will always work well enough to provide snap in the swing and square the face up. If you feel your hands are more
relaxed with thicker grips, and your grip is correct, you will not experience
any problems with slicing.

As a rule, golfers with smaller hands will require smaller grips so that they are able to close the fingers around the grip, but remember - No Tension.

If you fall into the category of golfer who finds discomfort in closing his/her fingers, and have only one option but to run the club through the palm of your hand you may want to try the non-tapered grips as used in the ‘Natural Golf’ philosophy - where there is little to
no hand rotation.

The majority of grips these days are slip-on grips divided into soft and hard types, and there are several variations on the market.

Rubber grips are a blend of liquid rubber and granulated cork, pressure moulded and then sanded and painted. These grip are easy to install and some have reminder marks or ribs running down them. These are firmer grips which give greater feedback from the clubhead (good for wedges).

Polymer grips are soft and absorb vibration so you have less feedback from the clubhead (good for medium and long irons). These are good grips for the average golfer, but are more expensive than rubber.

Leather grips are made of cowhide or calf skin, these grips are wrapped around the shaft and have a soft feel and provide excellent tackiness, but are very expensive.

Corded grips are corded with strands of thread which creates a rough non-slip grip, but it does tend to wear out gloves quite quickly (my favourite grip for a driver). They are also heavier with the cord. The weight of a grip is paramount when either changing your present grips or choosing grips for your new set. Changing the grip from a 50 gram grip to a 40 gram grip would increase the swing weight considerably depending on the club specification. Most grips on the market are between 35 grams and 65 grams, but that is assuming the set is going to be a traditional swing weight.

There is nothing crazy about adding weight to a grip to put more weight under the hands, as this can aid any golfer who has a faulty start to the downswing (casting). Jack Kuykendall experimented for three and a half years with grip weights and discovered the perfect weight for a grip was 90 grams, so don’t be afraid to experiment.

Final Thought
The golf swing is not a mad rush with the body. The club should be swung with the hands, so make sure your contact with the club is secure, relaxed and correct,
and a well fitted grip can help you achieve this.