It was a bit pricey for me but I loved the design of this piece. Did not receive the full allotment of hardware to complete install. La parte interior de los cascos tiene una almohadilla gruesa que forma un hueco amplio que yo creo sirve para dos cosas. I wouldve liked it more if the bottom was reinforced with some type of cardboard to keep it flat but its not needed. My 3 year old and I are in LOVE! UPDATE . Meaning its an overlay. If youre a half or between sizes, go up. I really dislike taking 4 huge vitamins in one day. The price is fantastic and so is the comfort.