I've searched and read all I could find here on high altitude mittens and it seems like BD Mercury mittens will be sufficient for North Col of Mt. Everest (23000ft) since it doesn't get brutally cold until above that camp.
I do like my fingers and have all the intentions to keep them, so if beefier mittens are required, I will get them. But trying to be reasonable with the cost of the expedition I don't want to go over board where I don't need.
Does anyone think Mercury mitts are bad idea for North Col? I tried them recently in a shop in Leadville, CO and I was somewhat split on the three finger inner liner design. It's great for dexterity, but I wonder if it sacrifices the warmth?
If Mercury is too lite for my purposes, I will go with MH absolute zero or OR Alti mitts, but I would like to hear community opinion first.
P.S. I will also use them for Mount Washington, NH winter climb.