I've used these twice since getting them. The first time was shoveling snow and the temp wasn't really that cold and this morning on a 40 minute walk in Connecticut low 20 degree weather with some pretty good wind. These mittens really surprised me, as they appear to be somewhat on the thin side. They actually kept my hands pretty warm although my thumbs started to feel a little cold. Not sure if that's a function of the way mittens are and the thumbs being separate from the rest of the fingers. This is my first pair of mittens that I can remember in my 64 year life. I probably could've given them a 5 star rating but will reserve that for now. I might pick up a different pair just to compare.