Oval mattress for the Stokke® Sleepi crib, made of polyurethane foam. Polyurethane foam gives elasticity and is particularly durable under pressure. It is firm and breathable to minimize the risk of suffocation kai CO2-Retantion. It is also hypoallergic and removes moisture that accumulates during the night. It has a tight fit ti sleepi crib which is minimizing the risk of entrappment between bed and mattress. It will offer to the growing child the support and comfort it needs!