I bought this to use as a liner for a warm weather sleeping bag and it works just as expected. It is a nice soft, relatively thick fleece and certainly makes the bag warmer. While it won't turn a summer bag into a winter bag it probably adds 10-15 deg to the rating of you bag when used as a liner. This is much better than the Stan sport fleece liner I bought previously which was much much thinner and really didn't do much when added as a liner. I would recommend this to anyone looking for a good sleeping bag liner.
Rating: [4 of 5 Stars!]