Baseball cover is a term used to describe the materials used to make baseballs. COWHIDE, CHIDE, and LEATHER are all materials used in the construction of baseballs. COWHIDE is a type of LEATHER made from the hide of a cow, which is tanned and treated to make it durable and suitable for use in baseballs. CHIDE is a type of LEATHER made from the hide of a sheep, which is also tanned and treated to make it suitable for use in baseballs. LEATHER is a general term used to describe any material made from animal hides, which can be used to make baseballs.