Create a comfortable and supportive Junior Bed for your child up to 10 years old, with the Junior Bed Extension Kit and SnuzSurface Mattress Extension Piece. The Mattress Extension Piece slots easily onto the mattress base next to your existing SnuzKot mattress, once converted to a junior bed. The SnuzSurface mattress extension piece arrives already set up in support 3, ideal for your growing child.