Your boots maybe to warm for +20 causing your feet to sweat to much. Think about it, your feet were warm enough to sweat! ASA, you may have other issues. Ever had any could weather injuries?, or any injuries to your feet? that may cause a loss of feeling? You have to be able to move your toes, exercise them in your boots. They should not be getting cold at 20 degrees, if you keep them moving. If it was real cold like -0, I would say one pair of socks and VB Boots, your feet are going to sweat thats what they are suppose to do, keep wiggling your toes. If you don't do anything your feet will get cold. I spent 7.5 years at Ft. Wainwright Alaska, (outside Fairbanks), been to summer and winter IQC (Instructor Qualification Course) at NWTC (Norther Warfare Training Center at Ft. Greely)I was the CWI instructor(Cold Weather Indoctrination)for my unit, blah, blah, blah gota love those acronyms. We wore Mt. boots to +20, then military muklucks till -0, then switched over to VB boot VB's are suppose to be good to -70 if you keep your toe/feet moving. I used them for snowmobiling, winter caribou hunts, calling fox. Nothing like taking your muklucks apart to dry and having the bottom pad frozen to the bottom of boot. Paul