A. "Game improvement club" is a very broad term given to any golf club or clubhead that is designed to offer less distance loss or less of a drop in accuracy when the ball is hit away from the center of the clubface.

There are no measurements of the game-improvement capability of a club or clubhead that can take all of the possible individual game-improvement design factors into account.

In general terms with woodheads, the larger the head, the higher the clubhead's moment of inertia about the vertical axis of its center of gravity, the larger the face area, the shorter the length, the lighter the overall total weight of the wood, and the higher the loft angle on the clubface, the greater the game improvement capability of the wood will be.

With irons, the larger the head shape, the deeper the cavity on the back of the head, the wider the sole, the more round the sole shape, and the more loft on the iron face, the more game improvement benefit the iron will possess.

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About the Author
Tom Wishon is one of the most highly respected members of the golf equipment industry. He specializes in clubhead design, shaft analysis, and clubfitting research and development, and is the owner of his own golf equipment company, Tom Wishon Golf Technology. Tom is a member of the Golf Digest Technical Panel, and is the Technical Advisor to PGA.com, the website of the PGA of America.