This is a harness for the Stokke Tripp Trapp. It features an older design with a cat motif. The third picture shows the part that attaches to the chair's seat. It worked with the latest Tripp Trapp, purchased around January 2025. Please refer to the manufacturer's website for detailed instructions on how to use it. I am selling it because my child has become able to eat calmly. It was very convenient.