US Army Nomex Jacket Liner US ARMY sage green Nomex, (Aramid, fire retardant) jacket liner. Wear it under your Nomex flight suit or lightweight flight jacket. Insulated and 100% Aramid. Knit cuffs and plenty of buttons and button holes for easy use. WHILE SUPPLY LASTS! 6 SIZES ONLY! Small Short: NSN 8415-01-394-3827 Medium Regular: NSN 8415-01-394-3833 Medium Long: NSN 8415-01-394-3834 Large Regular: NSN 8415-01-394-3837 X Large Short: NSN 8415-01-394-3857 Large Regular: NSN 8415-01-394-3842.