OK, How about Dry Suits?

[Chris H]

Thanks Bill.
I don't think I see a noticeable difference with argon over air either, but I tend to use Argon.  I will have to give the handwarmers a try.  I tried some of the chemical style, reusable heaters, but they were just too bulky to get into my gloves.  I was initially concerned about overheating of the disposable style warmers while using an inflation gas with a higher O2% than air.  However, now I always use a separate inflation system for my suit so that isn't really a factor.  I recently used some of the "toe warmers" above water, and they were very thin and had an adhesive backing that would probably work well in the tight confines of my dry gloves.