Many many years ago we bought a pair of inexpensive bags from LL Bean. They served us very well, and still do, but as they are both rated at 35+ degrees. I thought it high time to invest in a pair of really really good bags as we were planning this southwest tour in March and early April.. After months of research and hand wringing I settled upon the Big Agnus line.. We bought the him and hers rated at 15 degrees. We also bought the therma-rest neo air inflatable pads, which as all the reviews stated, would make those bags live up to their 15 degree rating... The bags are extraordinarily comfortable and compress nicely for stowage in our trailer and in our backpacks, but 15 degrees ?? NOT,, we shivered our butts off at 22 degrees.. In all reality, the bags perform really well down to about 25.. We ended up buying a propane tent heater to aid us for those nights below 25.. I'm just a bit disappointed with Big Agnus..