What is it?
A new sole rail design on all C523 metals that extends from leading edge to trailing edge.

What does it do?
The new sole rail design produces a super-low CG for high-launching shots with optimized spin rates and maximum ball speed off the face. The rail design lowered the CG and allowed for a 29% increase in hitting area on the face of the driver, making it easier to achieve greater power and increased forgiveness.