Well after trying all the top gloves made And nearly getting frostbite
in the process , I purchased the alt mitts. They are they only gloves or mitts that allowed me to
Hike In temps 20 and under. If you take a large order a med they run very big. I also used these while mountaineering in ice and
never got cold . My hands unlike others are cold in temps 35 and under With very warm glove son. The inset really is like a large super soft pillow
What I found that makes them so much better is the insulation on the back of the hand, Almost all others are packed under the palm. My hands did sweat in them which can cause problem so I do reco liners to stop this also makes the mitt fit snug. I have done lots of research and this gloves has made it to the summit of everest many times over its been tested.

I tried on every pair of high alti. gloves I could find at the Backcountry retail store. Those guys helped me out a ton and were very cool getting every pair out there! Some were too slippery on the palm trying to pack the insulation in there and others just didn't fit well. These fit perfect, have amazing grip all over the palm and are wicked warm! I have cold hands problems and know I'll have zero problems up in the sinks where some of the coldest temps. in the country are registered! I'm really looking forward to testing them out!

These are the only mittens that my wife felt her hands to be warm in. That's at temperatures of -5 deg. F. Snowshoed in rough hilly country.

Had these mittens on Mount Logan in the St Elias area.And in the extreme cold my hands were still warm!

These are the ultimate winter mittens. Used this past winter where temperatures were hovering around 0F and these gloves kept my hands nice and toasty warm. No need to fear frostbite at all with these mitts. Despite the steep price tag I highly suggest getting a pair because you'll have to look nowhere else for mitts again.

I have last year's version of these mitts. I tried on this year's at a local shop and discovered that they've fixed the problem with extra large! My hand measurements are exactly on the line between large and extra large according to OR info. I found the large too small and the extra large too big (last year). This year, the extra large is perfect. As for the guy who asked about people with Raynaud's Syndrome, I don't have it (at least not to my knowledge!) but my hands get awfully cold when others don't. These mittens have solved that problem. In fact, I can't wear them above 10 degrees or my hands sweat. So far, coldest I've worn them is minus 10 with a 45 mph wind, exposed above treeline for about an hour. Fingers were toasty warm!

I have Reynauds and ski 35 days a year with these mittens and hand warmers and Have no problems.
I was always buying mittens and more mittens to find something warmer, but since I bought these I haven't used any others. I don't ski with the pole straps but these are a little bulky to use my straps well.

I get cold hands. When I was young I could ski all day with gloves wet enough to wring water out. In my 6th decade, things aren't like that. Cycling with regular ski gloves doesn't cut it. Reviews of serious cold gloves and mitts that a few people complained aren't warm enough moved me to try something nobody said this about.

I went out in -6F windchill today. I exposed my bare hands to cold getting my bike stuff ready before heading out, so I gave the alti mitts a major test, i.e. to warm my cold hands, rather than merely keep them warm.

I started with the liners. This worked for the right hand, but left was still cold after a few miles, so I put the outer shell on it. This worked, and I was then able to remove it and just use the liner, and my hand stayed toasty.

Later WC went to 15. My hands got sweaty, so I switched to the windproof Gore-Tex shells over thin liner gloves.

Braking, shifting, and adjusting zippers worked fine.

Take-home lesson: the liners alone are fine for sub-0 for a person with cold-sensitive hands. Shell and liner combo should be good for another 30 degrees lower.

I looked at Burton AK Mitt, which I'll bet is also toasty, but it only has a 1 year mfr warranty. BD Guide is also 1 year. OR's is lifetime. For this kind of money, I think lifetime coverage is called for.

Recently climbed Aconcagua and was lucky to have great weather. On summit morning it was 7 degrees (F) above zero with a wind chill somewhere below that. My hands never got cold and as the sun came up and we reached the mid point of 21,000 ' I changed to my standard ski gloves. On Aconcagua though it is better to be safe than sorry. These are great Mittens and the folks at OR are great to work with.

I have been on several high altitude expeditions and have had frost bite on my fingers three times. I have very little circulation left in my fingers so for the trip that I going on tomorrow I purchased a Pair of OR alti mitts. I have used them on three practice climbs in the past few weeks. The mitts seem to work very well and I feel that they offer me the best chance of coming back with all my digits this time.