Consisting of two soft layers of flexible, Stimulite honeycomb fused to the back of a robust bottom layer, the high-performance Stimulite Bariatric cushion provides maximum pressure relief, stability and ventilation. Total Pressure Management®? Accommodates Weights Up to 650 lbs. 3" thick 7-8 lbs. washable sizes range from: 20" to 24", 25" to 28", 29" to 30" consists of three layers of specially engineered honeycomb an optional incontinence pad fits between the cushion's top and bottom layer flat bottom only available with polyester or sheepskin cover ?