Sedens 410 Seat Cushion Alternating Cushion works with APEX alternating mattress system pumps and hybrid design with alternating therapy to relieve pressure.Specifications The mattress type is dynamic cushion Dimensions of the cushion 44 x 41 x 9cm The cell height is 3"Weight of cushion is 1.11 kg No maximum weight capacityFeatures Hybrid cells 24 hours pressure area care Non-slip base Removable top and base covers for easy cleaning 4 way stretch cover ..