This inner bag should be used primarily as a summer sleeping bag, but I found the fabric is not very soft and comfortable, even if it is not scratchy or so. Furthermore always remembered tip of the upper jacket out of the bag, despite the inner loop, with which you can fasten the jacket. This would already be my next point of criticism, the loop! A push button would be here much more practical, would keep better and not easily absorbed as the loop.
Final verdict: Not bad, but in my opinion, there are better inside or summer sleeping bags!
My recommendation here is the sleeping bag from Popolini Felinchen organic cotton for 19,90 also an indoor bzw- summer sleeping bag! This was in addition ordered sleeping bag from Amazon, which I then notice, because he just made me believe :)