I wore these boots for a week in the San Juan Mountains. Two to three feet of snow already on the ground, ten inches of fresh snow accumulation, tempertures below zero at night and highs in the teens and low twenties during the day. The boots performed very well and were put to the test; mixed climbing, snow shoeing and mountaineering. My feet were warm and dry the entire trip, others in plastic boots complained of cold feet. Money well spent.

Was excited about this boot, US size 14 (48) seems hard to find (not sure why, in mountaineering boots you're supposed to go one size bigger, and size 13 seems fairly common). Unfortunately it dug into the outsides of both my feet BAD just walking around the office for a while. I tried removing insoles, lacing loosely, everything, still rubbed. I was so disappointed because otherwise it was comfortable to walk in, felt lightweight, looked pretty damn cool, and represented a warm, flexible alternative for me vs. leather boots as I get too cold in them. Also I wanted something I could take to Denali or do any sort of Winter climbs. Even for spring/summer, I previously tried the Lowa GTX boots and my toes got way too cold even in good weather from 12,500 up on Rainier.For a Mt. Adams climb I did a last minute REI switch from Baruntse to the Invernos due to burn issues on the Baruntse. The Invernos are a bit loose to I'm on the fence due to ankle protection, but I'm going try tightening the inner boot more and maybe putting on some neoprene ankle wraps to fill out volume/provide more ankle support. Invernos are sort of a last resort as they just don't feel like a great fitting boot and are heavier, it's like a completely inflexible big plastic shell, then and inner boot. But what can I do? Open to other boot suggestions. Want something that can do winter + June Denali, in addition to Rainier spring/summer (I’d rather be too warm on the feet). Plus I need the boot in a US 14.If you have narrower feet, this boot may be awesome for you. Also if you have this boot, write a review because I literally could not find one review on this anywhere and I hate buying un-reviewed items. I will say that I don't consider myself to have wide feet necessarily, I guess maybe just slightly wide? I fit most other shoes/boots aside from a lot of Salomon trail runners which run super narrow. Anyway 3 stars but if you don't have the rub problem maybe these could be 5 star boots for you.NOTE: backcountry doesn't carry anything beyond a size 47 in this boot, bought the 48 from a local shop near Mt. Rainier.

So far, this boot has lived up to all my expectations. My foot size is 11 (US) and kind of narrow at the heel. After researching various double boots, I initially purchased the LaSportiva Spantik boot (got UK sizes 45.5 & 46) through REI. Although this boot is a top performer, I had too much heel lift (at least 1/2 inch) and also had some heel lateral movement. In addition, I did not like the outer boot lacing system with "thin lace", plastic sleeves, and "plastic wedge" that you anchor the lace down with.

I also tried UK sizes 10 & 10.5 in the Scarpa Inverno and was not happy with the fit. Although a UK size 11 or possibly 11.5 would have fit better, there is no getting around the fact that a double plastic is going to be pretty stiff. In contrast, the LaSportiva Baruntse
(UK size 45.5) fit like a glove. Since purchasing them a month ago, I have used them on several training hikes and have not had a single hot spot. My only complaint was having to trim a little plastic off the Superfeet insoles I added to the boots (the Superfeet insoles were causing some soreness on the outside edge of my feet). This slight problem (easily remedied) was in fact the Superfeet insoles, since I later tested the thinner factory insoles and did not have this issue.

The Baruntse was kind of "spendy" at $600, the extra money over traditional "double plastics" was worth it. The boots have heat moldable inner "booties" you can heat up in your kitchen oven and have a "speed" lacing system with velcro tabs which work fine once adjusted. The outer boot hase a space age aluminum heat reflective layer, and has a traditional "tried and true" lacing system with metal sleeves which I liked better than the Spantik design.
All in all, a great boot which I look forward to wearing on Aconcagua in a few weeks.