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When you're sitting for a long time, you need some form of pressure relief to stay comfortable and prevent stress on the surface of your skin. An alternating pressure seat cushion works to accomplish pressure relief through an air pump. For instance, the ErgoDynamic Seating System pumps air into and out of varying parts of the seat cushion, helping to relieve any pressure you might feel after using your wheelchair for a length of time. Alternating pressure seat cushions have a heavier weight, due to the necessity of pumps and batteries. However, technology advancements over time, will lesson the weight of this type of seat cushion.