When choosing a Pressure Care Mattress, it is important to consider it's effect on skin protection. Pressure care mattresses may be either static or dynamic. In general, a static mattress refers to a mattress that doesn't move when a person lays on it. A pressure relief mattress is essential equipment for anyone at high risk of developing pressure ulcers or who have existing pressure ulcers. All our pressure-relieving mattresses use alternating pressure. This means that air is pumped into cylinders that are placed parallel to each other inside the mattress. As one set of cylinders inflates, the other set deflates. This way the pressure under any part of the body is relieved on a regular basis. Achieving an exceptionally high standard in pressure management, they operate by a sequence of air cells gently inflating and deflating in accordance with established alternating principles.