This unique bump helmet provides impact protection while using hearing protectors or noise-attenuating headsets, eveloped specifically for the flight decks of all US aircraft carriers, this unique bump helmet provides impact protection while using hearing protectors or noise-attenuating headsets in one of the most hostile environments on earth.The HGU-24/P Flight Deck Helmet has three components: A Suspension Liner ,A front and a back shell assembly, Energy-Absorbing impact pads, Aural Sound Protector , size 7 – 1/4 helmet liner, constructed of cotton/polyester and nylon mesh, provides excellent ventilation and long-term comfort. A hook and pile fastener chin strap assures easy on and off as well as snug and fit every time, helmet is used but in very good condition with googles include earphones, boom mic, communications cord and all avionics and plugs, very nice display helmet !!! also the display head is include !!!note that all our items are pure collector items or display items. The items are not tested for real use and have no aeronautical exams or clearances. Use is at your own risk !