To fit chest (advised): S 32"-35", M 35"-38", L 37"-40", XL 40"-43'', XXL 42"-45", 3XL 44"-47", 4XL 46"-49", 5XL 48"-51". Introduced in 1959 and designed as an intermediate weight flight jacket for use in a cold weather climate, the MA-1 became the classic US Air Force flight jacket. Although it was issued to pilots just until 1977, nowadays it is possibly the most popular clothing item ever designed for the United States military forces. This warm and comfortable MA-1flight jacket is made of durable and windproof nylon, goes with heavy-duty front zipper, and features two side pockets, two inner pockets, all with press stud fastening, and one zip patch pocket and arm office on the left sleeve. Moreover it is traditionally tailored with fluorescent orange-colored inner lining.