The key to socks is WOOL and thick! Also when using multiple layers is make sure that they are sized so they are never tight on your feet .
You should be able to wiggle and spread your toes easley to matter how many layers.
I sleep with 3-4 layers of heavy wool socks in the colder temps the same I use in my boots or mukloks for insulation during the day with good luck.
I found down booties compressed to much to work for me.
One thing you can try . If you have a summer mummy bag take it and
double it in to it self and then put your feet and legs in to it. It will only come up to your groin but will make a world of difference.
fourdog
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