These pajamas are 100% cotton from Combi Mini. They were worn for one season. While they show signs of use, they still seem wearable. The buttons are large and easy for children to fasten, a testament to Combi Mini's quality! The hem of the pants can be lengthened slightly by removing the thread. The pants also have buttonholes to attach to the top, so the stomach won't be exposed, providing peace of mind.