These boots are pretty warm.. I've taken my 2 hour long walks in them in 10 F weather with a good quality pair of wool socks and my feet stayed warm.. They are not meant for long periods of walking in the snow.. I wouldn't wear them if I was to be in deep snow for hours. But for an average walk with a good pair of socks on the colder days, they are perfect.. Also, they were comfortable from day 1. No break in time needed..Not heavy at all. solid build. I highly recommend these as a cold winter boot..