Jacket: vintage fox knapp puffer coat large made in usa used

Label: fox knapp large distinctive sportswear made in usa No indication of material, but i am suspecting nylon for the shell. Not in mint condition, worn, song stains here and there, but a very cool old coat! Combo zipper and snaps. Zipper is in solid shape. Faint musty smell that will come out easily with a spray Armpit to armpit: 22” Shoulder to bottom: 28