The cushion I received does in fact attach to the chair with an elastic strap in back and two ties where the back meets the bottom. But that's not my problem with these cushions, mine faded really bad inside of the three weeks I had it outside. The cushion itself is comfortable but the fading is not acceptable in my opinion. If it were a sunbrella fabric it would not have faded. I will not be buying this cushion or any other unless it is sunbrella at least I know it won't fade.