Firm with breathable layers for a safe sleep A mattress where they'll sleep like a baby. For optimal safety and comfort, it's important that a baby mattress is high-quality, firm and breathable. ​ A breathable mattress ensures that the air can circulate and remove the carbon dioxide exhaled by the baby. In this way, overheating is avoided. This is especially important when the little ones turn over onto their stomachs while sleeping and breathe into the mattress. The Stokke Sleepi Mini mattress is made with multiple layers of breathable 3D mesh with a Sorona Bicomponent Stretch fiber core to offer firmness, maximal airflow and to exceed the highest safety standards.​ Both the core and cover can easily be removed for washing. Cover is machine washable at 60o Celsius and core can be cleaned by rinsing. Comes with a wide range of coordinating protection covers and sheets.​ Firmness for baby’s safety & comfort​ Layers of breathable 3D mesh for airflow ​ Sorona Bicomponent Stretch fiber core ​ Made to perfectly fit the Stokke Sleepi Mini ​ Both cover and core are washable Compatible with Stokke Sleepi Mini V3 and Stokke Sleepi Mini V2.