The two sleeping bags (blue and pink) are technically identical. The outer fabric is very thin and made of polyester. The fabric device easily in the zipper. How long does this by holding without damage is at least questionable. The lining is made of cotton or a mix. The interface is really nice and comfortable, but this tends to fluff ... Have him washed once only to the fluff (which is spührbar also in the nose) to counteract. After washing in the delicate cycle at 30 °, the filling tended to "lump". We had to bring once again to form the whole. The temperature range is specified with + 4 / -4 °. A statement that is not understandable to us. The sleeping bag is displayed for the "summer use" quite heavy and thick. On the other hand too thin for a pure winter use. Perhaps the identification as a pure summer would be - have fun sleeping better. All in all, just "useful and nice to look at." Next time we go to the stores and try out directly in order to compare to.