A visor was used in conjunction with some Medieval war helmets such as the bascinet. The open-faced bascinet, even with the mail aventail, still left the exposed face vulnerable. The bascinet is differentiated from the cervelliere by having a higher, pointed skull. Later, certainly before 1400, the bascinet was increasingly worn on its own. The bascinet had a mail curtain attached, a camail or aventail, which superseded the coif.