Feet can be a tough nut to crack. Durning the rut this year, morning temps 21-25f, I used uninsulated pack boots with felt insoles, and a heavy weight wool sock. 5 hour sits. Yeah, my feet got cold (annoying cold, not unbearable cold). And I forgot/left my 1200 gram insulated boots and Arctic Shield booties at home!
As a kid hunting mid-Michigan, I had cheap KMart (yep, KMart) “leather” boots and doubled up on cotton socks. Could barely squeeze my foot into them. I was 14 and still vividly remember how miserably cold my feet were on a snowy, windy, 14f morning sit. Like borderline in tears cold. Still sat there. Had my fist sips of blackberry brandy, provided by a family friend hunting with us, at the car to warm up. That’s how we did it in the 80’s. Lol, not recommended. Don’t know why my Dad let me go out there that way. But he gave me his pack boots after that. Pure heaven compared to my previous misery.
Anyway, these days for sub-30f hunts, an insulated pack boot (felt, not Thinsulate), heavy wool socks, and maybe chemical warmers. Wiggle my toes often and remember that day at 14. If I have a hike, I’ll pack the boots in and/or change socks when I get there. A well fitting insulated boot, dry feet, and quality wool socks take me a long way. That’s the best I’ve found yet.
These might be a good option to pack in for a long sit.
https://www.westernmountaineering.com/down-garments/booties/expedition-booties/