SIZE:Suitable for most Armless Chair: Fit chair size back length: 54.6-64.8cm/21.5-25.5 inch,back height(above seat): 33-43.1cm/13-17inch,back thickness: 12.5-17.8cm/5-7 inch,seat length: 53.3-58.4cm/21-23inch,seat width: 46.4-56.5cm/18.25-22.25 inch,seat thickness: 22.9-27.9cm/9-11inch.