Since baseball is usually all men on the field, jockstraps and protective cups are common pieces of equipment during gameplay (ladies use pelvic protectors). Both are used for the comfort and protection of the genital area during gameplay. Jockstraps are elastic bands that go around the waist and a front panel made of a breathable polyester or cotton. Protective cups are curved pieces of hard plastic that can fit inside of jockstraps. Neither of these are required pieces of equipment, but since baseball has a high risk of injury and some contact it's smart for players to take precaution.