Mens wool coat with 200g thinsulate lining. This is possibly the warmest coat I have ever worn, even more so than the filson mackinaw jackets and just as well made. I removed the lower pockets because I did not like them and it left a faint line which will likely go away pretty quickly the more it is worn. I never got much use out of it because of how warm it is. Perfect coat for someone who needs the absolute warmest. Handmade in the USA.