Mach 1 is what you are thinking about. I tried it out for a month but didnt like having something in my ear. Years of using ear plugs will do that to you. Lightspeed worked with an exchange and I got the 30xl with the mp3 and phone adapter hook up and I love it. The phone adapter comes in handy when I need to call maintenance on a tight turn and dont want to take my headset off. Very comfortable and not much bigger than the bose. I like the bose but could not justify another $400 when this headset is just as good. I fly the CRJ-200 and I am more concerned with my long term hearing and comfort than how it messes up my hair. Lightspeed has superb customer service and great products.