In reply to connor:
Hi Connor,
I used the Siula last year in Korzeneskaya (7100 m), Pamir and never had any trouble until I went down to the basecamp after summiting. I tend to have cold feet but with the Siula I did not get cold at any point, very easy to wear and take out as well. The problem I found and only realised at basecamp was that both inside loops in the boot and the inner boot were torn. I contacted Boreal and they told me that they never had this issue before and fixed the problem without charging. Maybe I was to excited to go out on the mountain and was pulling too hard
......
All in all I think it is a great boot and it could definitely go a bit higher in altitude.
It really depends on what use you want it for?
Hope that was a bit helpful and if you need anything else let me know.
Cheers
Kostas