WWII US M-1 Helmet Liner ONLY by St. Clair-This is a very desirable low-pressure liner made by St. Clair. The smooth green exterior finish is mostly intact. The interior is an interesting mix of OD 3 and white rayon. There was a fixed chinstrap but this is missing. The buckles remain. There are unfinished A washers. The sweatband is in fine condition. A desirable liner!