Restore Life And Comfort To Your Mesh Office Chair Seat! The Stratta Mesh-Chair Seat Cushion retrofits your Aeron or other mesh chair with this comfortable seat cushion. Not only does this specially-designed cushion increase seat comfort, it also reduces instances of clothing fabric pulls. Slips on easily. Made with environmentally-friendly BioFlex Hybrid soy-based foam. Sizes to fit many popular mesh seats. Cushion height is 2". Large size is 19"D x 18-1/2"W. Chair Not Included.