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A new racket feels better with one or more overgrips, depending on your preferred thickness and hand size. But once the rubber on the grip or overgrip wears down, replacing it will provide a better feel and a perfect grip—almost like having a brand new racket. Overgrips need to be changed more frequently in summer due to perspiration, but their lifespan is determined by each player. When the grip becomes unreliable and slippery, it's advisable to replace it.