The SAM is a static air mattress overlay which provides very good comfort, pressure and pain relief. It is used preventively and in the treatment of pressure ulcers up to and including sore degree 2. The mattress is divided into three zones, which amongst other advantages gives better support while sitting on the mattress, and it is produced in a soft and durable polyurethane ( not PVC ). The support pump delivered together with the mattress, is easy to use and very quiet. Through the special design of the mattress, the user can choose to use the pump either constantly or only for the comfort setting. SAM is delivered with a soft, elastic and breathable hygienic cover. It is a durable cover, which is easy to clean and with a very well documented hygienic standard.