It depends are where your at, but Im in Salukipv1 general area and I use 800's most of the time. After having extremly could2 years agoI decided to add a pair of Battery powered socks. I have to say they helped a lot. I would keepthe poweroff most of the time, but once my feet would start gettign a little cold I would turn them on for a few minutes and it would help a lot. I personally wouldn't run them all the time, your feet would get to warm and sweat, therefor making it quite uncomfortable. Also, add a pair of socks underneith them that pull away moisture from the skin so if you do sweat a little, it won't make your feet uncomfortable once you turn them off. This year I didn't get cold feet once, it also might have been that I was seeing 15 - 25 deer a day when in the past I was lucky to see 5!