Best for cold lodgesFor the four hours between dinner and sleep above 4,000 m
Naturehike Down Booties
The single best comfort-per-gram item above Dingboche; useless as an outdoor shoe, so most people end up carrying these AND something for outside.

Crocs Classic Clog
~350 g/pair, wipe-clean, wears with socks
4.1 on Amazon (8,704 ratings)
Unbeatable in a lodge — on and off without bending down, warm over thick socks, fine for the walk to the toilet block at 2 a.m. They look ridiculous, which is the entire cost.
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Do not buy this if: You are counting every gram on a climbing permit. Take a thin down bootie instead.
Everything else we recommend in camp shoes & sandals, including the ones we think suit a different trekker.
Best for cold lodgesNaturehike Down Booties
The single best comfort-per-gram item above Dingboche; useless as an outdoor shoe, so most people end up carrying these AND something for outside.