Have the Sitzwürfel bought for my daughter (5) - are very well made, only the curiosity proved fatal ;-) Just a zipper prevents tiny Styrofoam balls it to spread throughout the room. I took a needle and thread and sewed the zipper. Otherwise very comfortable and ideal especially for children, since they can easily tolerate her chair due to its low weight. Conclusion: 5 stars there only if you do with the inner workings of getting in touch.
