For sale is a Thermolite Reactor sleeping bag or quilt liner. Info per the manufacturer: Thermolite® insulation is a hollow-core fiber that provides extraordinary warmth for its weight and remains extremely breathable It's very comfortable, more compact and warmer for its weight than fleece liners Adds up to 15°F degrees of warmth to a sleeping bag, or can be used on its own as the ideal warm-weather bag Thin drawcord with tiny cord-lock around the hood Very light and compact. I have used this a couple of times and it works. Haven't used it since I got my 0* quilts. It was washed & then put away. Pictures and more info Here $42 shipped conus