This can be used as a chair belt or a child safety harness. Chair belt: Approximately 10 months old to 3 years old Child safety harness: From when they start walking to approximately 4 years old The belt is an overall type, and when not in use, it can be converted into a pouch, making it convenient to carry. I used it only once, but my child didn't want to wear it, so it's almost unused. When shipping, I will remove the contents to reduce the thickness, so please be aware of this.