I am a sailor and as a kid, I loved to go out and sail on a small boat (sunfish) when the weather was pure crap. I would be out there in 50-60 degree weather, strong winds, etc. Several times, I tipped over and fell in the water. With a wool sweater on, I was soaked, heavy, but still warm. Wool is the wonder fabric and is used by athletes every day in every type of weather imagineable. I would buy wool boxer-briefs if I could find them.