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Much smaller than expected
It's a functional sleeping bag liner. The zipper works well. I'm not sure how much warmth it adds, but I used it inside a 0 degree bag (along with a sleeping pad) in 10 degree weather and stayed warm.
This liner is much smaller than the Thermarest sleeping bag I put it in. I originally ordered the regular size but had to exchange it for the larger size because it was so constricting. The larger size is okay, but still significantly tighter than my sleeping bag made by the same company. While I've decided to keep it, I'd try a different liner next time.