These are a one-size kind of chair cover with lots of stretch. These were easy to install except they were a really tight fit. Once on the chair, they did not loosen or come off. Our old church chairs were dirty and stained from years of use, but the chair covers hid all that and gave a pleasant, overall good look to the set up. With the white table cloths to the floor, they gave a very clean, elegant look to the space.