The Alerta 2 inch Foam Mattress Underlay is a foam mattress underlay for use underneath an air mattress system in the event of power failure or during the use of CPR. The underlay provides effective comfort and care for users in hospital, nursing and care home environments. To launder the cover in a washing machine, set the main wash to 65°C for no less than 10 minutes or 95°C for no less than 3 minutes. The cover can be tumble dried on low heat and the temperature must not exceed 60°C. The foam can be autoclaved at 134°C.