the correct name is ADVANCED TACTICAL FIGHTER MASK , it is supposed to be attatched on an MX O/PRO frame , when you wear an open-face helmet. al lot of pro riders used these ATFM's in the early 80's , and so did I . you get a litttle claustrofobic while wearing them before you start to ride, but when you are riding , you don't seem to care anymore. very cool piece