It really works well!

Just used it for the first time, in Zion National Park in mid April. It was cold! In the low 40’s at night. Previously we had frozen practically to death at those temperatures when our air mattress dropped to this temp, but not this time. We put in on the air mattress, then topped it with a sleeping bag, and then our sheets and comforter. I don’t know if we needed the extra bag under us, but anyway it was really comfortable and warm all night, never worked up feeling chilly at all. Highly recommend.

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