AeroSleep Sleep Safe Mattress Protector 60x120cmHow does the mattress protector work exactly? The AeroSleep mattress protector has a 3D structure, an absorbent layer and a waterproof layer. The 3D structure provides the necessary ventilation. The absorbent layer retains as much moisture as possible and the waterproof layer prevents any moisture from penetrating the mattress. This one piece mattress protector is fully machine washable at 60C so you can be certain that your child will always sleep on