Made under a contract with the Department of Defense, this mil-spec flight jacket is the one currently issued to U.S. Air Force pilots. It is engineered to perform in the tight quarters of a cockpit and stand up to adverse conditions. The fire-resistant NOMEX shell is rough and tough. It is known for excellent thermal, chemical, and radiation resistance. This jacket is made in the USA. If you want to go for a heavier weight, take a look at the CWU 45/P.