My thoughts are that they would increase sweaty feet. What I found that works best is a change of socks 3-4 hours in. I really never get cold feet much anymore. What I did was bought three different Lacrosse Alpha Burly Sport boots, non insulated, 1000gram, and 1500gram, then I bought three different marino wool socks, light, medium, and heavy. In a couple of years I was able to coordinate, depending on weather conditions, what combination to wear to reduce sweating and keep my feet warm. I did find allowing feet to get too warm and to sweaty was the worse. Also, a change of socks when my feet got sweaty fixed my cold feet problem. Now yeas later my feet hardly ever get cold. A problem I dealt with for over 30 years.