I found a few older threads on this question, and much heated debated over weather wool insulates underwater when wet (including responses from Pinnacle about their Merino linings). Anyway, this seems to be a little unsettled. I was thinking about trying wool socks under wetsuit boots to add warmth. Obviously, this is a cheap experiment, and I guess there's only one way to find out; however, I was wondering what the results were for people that actually tried this. Do wet wool socks inside wetsuit boots keep your feet warmer?