It is one size fits all. The dimensions are listed in the last image. I purchased it and put it on my home chair once. It did not fit the shape of my home chair, so I kept it at home. (It's a thin high-back, so it's hard to find one that fits.) I think it would be okay if the back side is an average-shaped dining chair, but please check the dimensions. I plan to fold it flat and ship it via Yu-Packet Post or Neko-Pos.