I bought over boot insulators for standing last season, but I did not try them out yet. If it is crazy cold, I'll drop a hand warmer in there.
Something like the link, but I forget what brand I bought. I got the recommendation here on the forum.

https://www.amazon.com/Icebreaker-B...mp;psc=1&refRID=0YD9DMG9MRSXMTD5MGCF