Callaway ERC Soft Golf Balls - YellowCallaway ERC Soft Golf Balls Yellow ERC Soft is Callaways longest golf ball with soft feel, and it's built for increased control around the green. This complete performance ball suits a wide range of player types and swing speeds, especially low to mid handicap golfers, with a Hyper Elastic SoftFast Core that increases ball speed off the driver while enhancing feel. The softer, lower compression core is paired with a GRIP Urethane Coating System that