Shaft flex has a bigger impact on ball flight than most golfers give it credit for. The options typically run from Ladies and Senior through to Regular, Stiff, and Extra Stiff, with the right choice coming down to your swing speed. Golfers with moderate swing speeds generally get on best with a Regular or Senior flex, while faster swingers tend to need Stiff or Extra Stiff to keep the ball flight under control. It's also worth paying attention to shaft weight. Lighter shafts in the 50 to 60 gram range can help generate more clubhead speed, which translates directly into distance. Driver shafts typically measure between 44 and 46 inches, with a longer shaft producing higher clubhead speed but sometimes at the cost of control. If you're unsure where to start, a custom fitting is the most reliable way to find the right combination of flex, weight, and length for your game.