Wow! What a great product! The first time you inflate the seat it takes a while - I had to leave it over night for it to fully inflate the first time. However this is apparently normal. Once I had done that it worked fine after that. All you do is unzip the seat and open the valve and it automatically inflates. Replace the valve and secure it to the chair and sit your toddler on it and away you go. It allows your toddler to sit at the table with everyone else and the height is really good. When you are done you open the valve and squish the seat to expel the air and do the zip back up. Simple. It has a pocket on the front too so you can pop a bib and cutlery in there. My little on is two years old now and wants to sit like a big boy, that added to the usually disgusting state that you find high chairs in, makes this a fabulous, affordable alternative.