Review on Lipport Waterproof Cycling Shoe Covers: Stay Warm and Dry with Thermal Shoescover for Men and Women, Perfect for Road and MTB Biking by Jack Herrera

I put them on for the first time today in dry weather around 45 degrees. My feet and fingers got cold, but my feet didn't complain. They seemed to be doing their job of keeping out the cold and wind. What was interesting was that they were slightly damp on the inside and completely dry on the outside, which tells me they were doing their job of insulating my feet and that the moisture was being generated by me and not coming in from the outside.