We got included a very simple mattress for the crib. This was quite hard. By requiring it becomes a cuddly paradise. There is a summer and a winter side. At the moment we use the winter side and to Biberna terry linens. The advantage of the support is also that it can be washed in the washing machine. Despite an incontinence pad as Einnässschutz on condition there is not the usual sweating. In addition, you can breathe through the fabric. That was important to me in a cot. The rest is just great!