Iron Raven; I got a used pair. Only wore them once to make shure they fit. As I understand,they insulate by the trapped air, your feet will stay warm, but you will swim in sweat. Considering the environment in them when their in use, hot and sweaty, I wouldn't be surprised if somthing( bacteria/fungi) wouldn't grow in them if they were not properly dried/ deconed after use. Maybe you should nuke them. Like I said, I've no personal experience living in them, (maybe its time) but from what I've been told, for cold wet nothings better. For cold dry mukluks. Thanks: Jim