There are several differences between the Callaway chrome soft and the Callaway ERC Soft golf ball. The first being that Callaway chrome soft was designed to be a premium tour-level ball. Callaway’s ERC, on the other hand, is designed for long-distance. The chrome soft has a compression rating of 75, while the ERC soft ball has closer to 60 compressions. The chrome soft cover is made of soft Tour Urethane, while the ERC features a hybrid of the multi-material outer cover. The Callaway ERC soft ball also has its triple track line technology that sets it apart from the balls like Callaway chrome soft.