Just spoke to my mate, who works at ABRO, in Bovvy. He has just read a report, that states the thermal jacket was made of asbestos. The jacket breaks down very easy and decomposes, when hot or constricted. Being an ancient Chieftain crewman, I slept on the back decks, gun rear, tent fasion many times! Wrapped up in our oily, wet slugs, we were probably breathing asbestos like fag smoke! Have no experience with Chally stuff, your views please gents?