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Helps equalize pressure and reduces sorenessSlip free seat promotes proper positioning and improves postureConvoluted foam improves weight distribution and air circulationHighly resilient convoluted polyurethane foam provides comfort and durability. Has a polyester/cotton blend cover which is removable washable and waterproofWeight capacity: 250 pounds; Dimensions: 18 W x 16 D x 3 HEven though our bodies are designed to sit. Complete with strategically placed padding it simply is not enough. Good thing we have a large selection of seat and back cushions for just about every sitting situation from the car to wheelchair and desk to park bench.