The unique Innova Extra Mattress Overlay and Replacement Systems provide alternate pressure therapy for patients. Powered by a digital therapy unit, the mattress automatically inflates and deflates every 12 minutes providing relief and gentle support to bedridden or immobile patients. The Innova Extra Overlay System is a single layer mattress overlay which has been specially constructed for use on top of an existing mattress and is powered by a digital therapy unit. The Innova Extra Mattress Replacement System is a double layer mattress which has been specially constructed and is to be used as a replacement for the original mattress.