Only used it once so far but it worked well. 25 degree F night, used exped SynMat UL 7 with it. My partner and I were nice and warm. Had a single thin layer on my legs, and two layers (one fleece, one cotton/wool blend)on my upper half, plus a wool beanie. We are smaller people so we had plenty of room to move around as needed. The zippers were a little finicky but with a little care they work fin
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