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Took these up to 6000m and my feet stayed warm the whole push without me needing to swap to a double boot. They're noticeably lighter on the climb than my old pair, which made the technical sections feel less punishing.

The insulation is so effective that I wore them in -30°F conditions without any cold spots, yet they still feel light enough for technical climbing. I've owned double boots before, but these single boots saved me from the extra weight and stiffness on the crux sections.

Finally took these up Denali and my feet stayed warm at -30°F camp mornings, which is saying a lot for a single boot. They're noticeably lighter than my old double boots, making the long carries feel less punishing. Only wish the cuff had a notch more flex for steep front-pointing.