The Sleep Safe Natural Pack was manufactured with sustainable products. The Naturalis® mattress core is partially made of vegetable oil, the mattress cover contains bamboo and the zip consists of recycled materials. The mattress core provides extra support to your baby?s back and the mattress protector?s unique 3D honeycomb structure creates a layer of air. The firm structure of the natural cold foam mattress ensures perfect back support. The zip-off cover is perfectly machine washable at 60°C. Read more… Features: The complex 3D honeycomb structure of the Aero Sleep mattress protector offers 5 major advantages: Thanks to the layer of air, your baby can breathe at all times, also when it turns on to its tummy. The layer of air better regulates your baby?s body temperature and protects your little one against overheating. In case of spills, any moisture immediately goes through the layer of air into the absorbent layer. An impermeable film ensures the mattress stays clean. This also ensures your baby will stay dry. The mattress protector acts as a natural shield against bacteria and allergens without any chemical treatment. Both the mattress cover and the mattress protector are perfectly machine washable at 60°C. This is unique in the market of baby sleep products.