I think the MUCK WOODY MAX are the best. They are rated from +60to -40. I wear a pair of
liner socks and a thin pair of under armor socks in warmer weather. The boots need to fit snug.
In colder weather I wear the liners and a good pair of HEAVY wool hunting socks, have a SECOND pair of boot one size larger. Use for hunting on stand and ice fishing. Very seldom do I have a problem with cold feet. They have good support for you feet, but I found the boots have to fit snug with no slop in the heal.