The material is 100% cotton and feels roughly like a sweatshirt. Thus it is more in the warmer half of the year (or the spring / autumn) suitable for winter, he is a little too thin. There is no separate information on sheep substances, only the notes as a seal "textiles tested in Europe" and "certified quality from Germany". Washable is the slip bag at 40 ° C - here I would have expected a washability of at least 60 degrees, somewhat analogous to underwear. If you use it only as a sleeping bag in the spare little bed like that might be enough, but just on the move and with the belt slots designed for this purpose you have already expected heavy soiling. A blurb in the sleeping bag I have searched in vain, was later able to find on the attached label. But since I fürgewöhnlich dispose this, I feel that as an unfortunate solution.
From the size of the slip bag for newborns is up in the first few months suitable - roughly equivalent to the useful life of Beistellbettchens. The cuff is elastic, does not cut into and adapts well to babies body. For smaller babies, the belt slots could so far prove to be disadvantageous that, depending on where the slip bag sits to babies can get tangled in the foot.
Overall, I like the bag slip - especially in its restrained, yet stylish look - very good!