Anyone wearing pac boots or sorels in 20+ degree weather are just giving their knees, hips, and lower back an unnecessary workout in pain and fatigue. There are better ways to keep your feet warm in the 10 degree temperature range versus wearing 6-8 pound boots.
1. Toe warmers, light boots, and some form of boot blankets. Artic shields for 25 degrees and up, ice breakers (no longer made) down to 10 degrees.
2. Or ditch the boots all together and wear alpaca socks, toe warmers, down booties, and artic shield boot covers. The down booties made by Feathered Friends have the most down filling. This combination will keep your feet warm down to about 25 degrees.
3. Going to sub zero temperatures, you will need wool/alpaca socks, toe warmers, those 6-8 pound sorel or pac boots, and some thicker boot blankets like ice breakers.
The colder it gets the more insulation is needed.
Same thing for the amount of time spent outdoors. The longer you sit out, the more insulation you will need.
----