mdwest
AH ambassador
The only boots I have ever been happy with for this are USA Military surplus “bunny boots”.
These are a white color, double layer rubber boot, with an air space surrounding your foot.
They also have a valve on them that you must open before flying above a certain altitude or, the air in these boots will expand, risking a tear in the material.
We used to call them "Mickey Mouse" boots... general issue for students attending Nor-War (Northern Warfare School).. and I think all of the Alaska based units got them issued back in the day (both guard and active)... WONDERFUL for cold weather..
https://www.amazon.com/Extreme-Weather-Waterproof-U-S-Military/dp/B004ZCW8UO
The white ones I believe are the "bunny" boots.. where the original black ones were "Mickey Mouse" (although we just called them all "Mickey" regardless of color)..