What is the difference between a pressure-relieving mattress and a pressure-redistribution mattress?

Pressure-relieving mattresses are designed to reduce pressure by contouring around the body, often using memory foam or specialized foam layers. Pressure-redistribution mattresses go further, using multiple zones, varying densities, or dynamic air technologies to actively redistribute load, particularly around high-risk areas, which can be beneficial for people at moderate to high risk of pressure injuries.