I've the same pair of micky mouse boots since the late 1980's. Warmer than any other boot I've ever had on (including some that cost several hundred dollars). Wear in conjunction with a pair of moisture wicking socks and a pair of wader socks that go up to my crotch.
I've tried a lot of things; battery socks, hand warmer packets, expensive boots, tons of different socks, etc. This is the only system that works for my sensitive toes.