I have never slept in just a liner as its never that warm here, but as part of a sleep system, in my opinion its a total waste. 5 extra oz for 5 degrees of warmth is not worth it. I carry silk weight thermals if I need extra insulation and that gives me lots of flexibility. it keeps my quilt clean, I use them when I stop in camp to stay warm, and I also use them in extreme cases while hiking if a freak snow storm shows up in july.
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