Hey all has any one ever used silk sleeping bag liners? I just saw some tonight and was suprized how light and small they were not to mention cheap. From what little I've read they can add 10+ degrees to your sleeping bag. I was thinking maybe they would work well by themselves in warm weather. In colder weather maybe sewing it onto a light weight fleece blanket. If it was sewn flush it would just be like one blanket. I'm not sure what the temp ratings or weight would be. I guess it would all depend on excatly what you bought. I'm just thinking out loud, what do you all think? Has anyone ever done this before?