What is the difference between straight/single/double bend putter shafts?

The shaft of a putter can come in different shapes. A straight shaft has no bend and is good for players who putt straight. A single bend shaft has a small bend near the clubhead, which helps with aiming and creates a slight curve in the putting motion. A double bend shaft has two bends and is good for players who like a bigger curve in their putting motion. The choice depends on how a player putts and what feels comfortable to them.