I had BD mitts and wore them out. Now have Swany. bought them because they looked like the same high-loft mitt. But they are NOT nearly as warm. I now use handwarmers most days.
FYI I noticed on BD website that they say the Mercury mitts are for -20 to 40 degree temps while their Absolute mittens go all the way down to -40. (that's where the C and F come together and is very Cooold.)
Thanks for the info on the Absolute mittens ... they look like dexterity might be an issue wearing them.