Callaway ERC Soft Truvis Golf Balls - BlueCallaway ERC Soft Truvis Golf Balls Blue 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