The age is appropriate --- from 6 months to 36 months. Material --- Nylon is very light and washable. Comes with 2 shoulder pads. Size --- Shoulder Strap: 2.5*70CM; Kidney: 2.5*60CM; Buttocks: 5*21CM. Uses --- The seat belt can be used in our high chairs but also in strollers and pushchairs. Required --- This is required. This safety belt makes it possible to put a clumsy child on a high chair.