I have used them up to 20 degrees Fahrenheit in very windy weather and they have kept my hands warm. However, I recommend a liner if below this level. I'm an outdoor photographer so obviously my hands and fingers are important and not allowed to be compromised so this combination was great. I used liner because my hands are always cold and I needed an extra layer. The only issue I had was that after a week of daily use (outdoors 7 hours a day) I found that they had stretched a bit. But after washing, they came back. At this price I wouldn't expect them to be made out of quality stretch fleece.
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