New Addie & Emma's Glow In The Dark Stars: 824 Realistic 3D Stars For Ceiling Or Walls In 4 Sizes – Twice The Glow Powder To Glow Brighter And Longer – More Realistic Looking Than Typical Glow In The Dark Stickers sheets Seat Height Adjustment: Yes With the children in Seat Height Adjustment: Yes Never Become Flat and Hard: We use the CeriPUR US Certificated memory foam material which never gets hard as a rock in cold weather and never go flat after a long time of use like a traditional pillow STARS IN FOUR SIZES: Break up the monotony of a typical glow in the dark stars ceiling by sprinkling stars of all sizes throughout your sky Their epoxy construction means they won't fall apart