Form Fit Stretch - Made of two-way stretch knit that will follow the contours of your furniture. Smart seam details and elastic bottoms help create a custom, reupholstered look. Features: Secure fit with sewn-in elastic hem Stretch fabric is perfect for easy to fit furniture Material:Polyester Spandex Two sizes and lots of patterns available for you to choose, suitable for most chairs on the market. Style 1 to 20 suit for chair size: Back Height:17.7-23.6 inch(45-60cm), Seat Length:15.7-19.7 inch(40-50cm), Seat Width:15.7-19.7 inch(40-50cm). Style A to S suit for chair size: Back Height:15.7-23.6 inch(40-60cm), Seat Length:17.7-21.6 inch(45-55cm), Seat Width:17.7-21.6 inch(45-55cm). Please refer to the detail size information on the picture.