Unique construction of high resilient (HR) molded foam provides maximum stabilization, positioning, pressure relief and correct seating posture. Inner liner membrane has bladders filled with unique polymer for greater stretch characteristics to reduce pressure. Deluxe cover is 4-way stretch for optimum skin protection. Cover is removable, washable and flame retardant. Cover has a moisture proof urethane backing. 18 Month Limited Warranty on cover and cushion. 18 Inch x 16 Inch x 3 Inch Weight Capacity: 275 lbs.