I just returned from another winter over night from 0 degrees to 4 degrees above 0 F. Alway had cold feet, but bought Goose Feet Down Socks with over shells for the midnight call. MY feet were so warm i almost took them off. I was using my Warbonnet winter top quilt and hammock gear 0 degree under quilt with a 2qzq UQp. They really are a great addition!