The ROHO DRY FLOATATION Mattress System has been designed to address the needs of the clinician care giver and the compromised patient by providing an environment in which the patient can comfortably lie or sit for long periods of time without the fear of compromised blood flow and the resulting effect of tissue damage/breakdown. The ROHO Mattress System achieves this by exposing the patient to compression therapy which addresses edema associted with chronic wounds and flaps, and by providing a system which conforms to the patients body without deforming the vascular bed. The ROHO DRY FLOATATION Mattress system is the ORIGINAL non-powered, adjustable, zoned, advanced pressure-relieving mattress overlay.