Hussain Kaderwrote a review of Marmot Expedition Mitten - Men's on February 4, 2018
Familiarity: I've used it several times
My first time using these was on a hike in the Adirondacks, with -26F temperatures (-30 to -40 with the windchill). My fingers were getting dangerously cold, and no combination of gloves was helping to warm them. Very shortly after putting these mittens on, my hands and fingers quickly began to warm up, and were protected from the severe cold for the remainder of the day. They were not a cheap investment, but considering the real-world functionality and materials used, obviously worth it. Consider me a believer!