Experience is the key, not hard and fast rules about ratings. I sleep very warm. I am quite comfortable in my +45 degree bag at +45 (when in a tent on my insulated-with-down air mattress). That will be about the only time I bother zipping it up. My +25 bag is useless for me at +45 as I'm too hot and throw the bag off... then I'm too cold. Back and forth all night between too hot and too cold. I learned this the hard way which is why I now have the +45 bag.
Originally Posted by ARGENT BRICK
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