This mil-spec flight jacket is the one currently issued to U.S. Air Force pilots under a contract with the Department of Defense. Made here in the USA, 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. If you want to go lighter-weight, take a look at the CWU 36/P.