Pretty good mitt!
To answer some question on here there is a mitten liner inside, not a glove liner. And the liner IS NOT removable. The leather is this new agey stuff that supposedly will hold up better to washing which is good news!
I whipped these out today in a deep powder day with wind chills between 3 and 10 degrees F. My hands considering how cold it was, did ok. I did wear an additional liner underneath these. The only cold spot I noticed the most was my thumb, however, I have terrible circulation, so I'd still say to buy these if you always have cold hands.
When I was moving, my hands warmed up really well (hiking and actually skiing). My hands stayed dry all day and the raging wind did not go through the membrane at all! The gloves' gauntlet system could be wider, I had to really tuck in my sleeves of my jacket in there. The cinch system on the gauntlet works well and the long strings so I don't lose my mittens is nice. The mittens also have a clip to stick them together.
Overall, if there was a 4.5 stars I'd give it that. It's a good mitt and worth the $$$ if you have really cold hands. Your hands will stay dry and warm especially warm if you are in motion at all.