We have converted our playpen lack of space as a bed and needed for a good and ventilated mattress. Since we had a Träumeland mattress in crib, the very inspired us, it would once again be one. It is good and solid, stable, point-elastic and even my great finds comfortable. The small sleeping super it and because it is a stomach sleeper, si gets the Lüftingskanäle good air. (Sleep at night now has 12 hours later)