I bought this for my 18 month old as I found it difficult to keep blankets on him. He is super tall and there is still plenty of room left in it. I use it on my Mountain Buggy Duet, which it is a little big for, but it still fits reasonably well (and half the price of the MB version) - I just removed the seat to install it properly with the elastic around the back. My tall 3 year old also fits in it, so I just bought a pink one for her. I'm sure this will make the cold morning walks to school a bit more comfortable!