If only protective glasses are used and not a full face mask, the face is bare and unprotected from the impacts of balls (the teeth, which are very fragile, for example). With this neoprene face cover, the face is simply but effectively protected from the impacts of BB's. This model is particularly well suited for wearing classic wide protective glasses (DLG Googles, etc.) that protect the eye area well, but offer no protection for the lower face.