Hi Jon,
Likely anything a bit thicker that does not cut off circulation would be fine, given that you were warm in a 5.5 with no heat packs. I use 5mm gloves if I am going to want to use my fingers and seal the wrists with my instruments. The warmest I have found are 5mm three finger mitts with dry seals made by Sea-Tux.
Best wishes,
Doug
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