The thumb is a bit tight, the finger area is fine. High quality materials.

My hands and feet are my weakest points when it comes to winter anything. I recently did a overnight camping trip where the temperature got to around 10 degrees F. The wind was blowing and my hands were getting colder and colder.

In my previous winter camping trips, I have tried varieties of gloves. Sometimes even wearing multiple layers of gloves. They all never truly kept my hands warm, I would always need a hand warmer slipped inside of them.

Well, except for this glove. Yes maybe its a mitten and not a glove but to me, this mitten is far superior in every way. You may not have the dexterity of a glove but that doesn't matter with this mitten. Because you can just take your hand out of this 'oven', do what you need to do, and then put the hand back in the mitten.

When I say 'oven' I really mean it, my hands were freezing from the 10 degree temps and wind. I put the mitten on and my hands were at a comfortably warm temperature in 2 minutes. If I needed to have fine finger skills, I just pulled my hand out, did what I needed to do, and then but my mitt back on.

Sizing was right for me, I may of actually ordered to big of a size. Mitten has good grip and I was able to grip a lot more than I expected.

So yeah, overall if you have issues with keeping your hands warm or are just going into extremely cold climates, buy these mittens. They are worth every penny

I've had a pair of the Extreme Mittens for a couple years and they have worked well, even on soaking wet days on the slopes. Had a chance to try on a pair of the Everest Mittens and immediately felt the difference in strength and warmth. On the really cold days they have performed so well I never needed hand warmers.

Got these mittens for my wife.
I think it is the first time her hands have stayed warm EVER.

They're warm but the glove doesn't have any aeris insulation padding around the perimeter of the mitten and a very thin layer of aeris insulation on the palm of the mitten, but if they had as much aeris insulation padding around the entire mitten (everywhere) as much as they do on the back of the mitten then they would be much warmer. And I would prefer that the wrist strap be like the fortress glove with fingers rather then be a velcro closer because the nylon webbing lasts much longer then velcro does. Also the cord locks that are supposed to keep the cuff closed around your wrists when you pull on the shock cords, well the little spring in the cord locks are completely defective. So the cuff closure on both mittens will not work.
But none the less I'm very glad to have them in my bug out bag and I will attempt to fix them.
Edit: I took the cord locks apart and then with needle nose pliers I squeezed the plastic part that looks like an arrow at the bottom of the spring and that released the spring. Then I put the cord locks back together and now they both work just fine.