If you play using terry cloth grips, you will need to use a Grip Powder.
This is talc that absorbs sweat and allows you to get a better grasp on the grip.
Buy it right here at The Badminton Shop.
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With Grip Powder from Yonex you can get a better grasp on your badminton grip.
This is talc which is mixed with resin to provide optimal sweat absorption. It also give you a much better grasp on the grip, at the same time easing hard terry cloth grips.
There are also other types of grip powder in a more liquid form, which has also become very popular over the years.