The Sealy Joyfulness firm mattress offers the comfort of a pillowtop with deep support for uninterrupted sleep. Sealy's patented Posturepedic technology supports your child’s body without creating any pressure points and SealyCushion(TM) Air Foam® technology provides added softness and air flow, ensuring your little ones don’t get overheated while sleeping. The innovative SolidEdge(TM) HD System® greatly improves the seating surface when reading or playing, plus a soft breathable knit cover helps fitted sheets grip the mattress.