These are a world of difference from the hard plastic on the armrests of my chair. They have a drawstring with a button clasp around the bottom, which keeps them on the armrests even though they are poofy and can also be moved around a little to maximize padding in different positions. I got a set for my wife's chair as well and she said they are great, too. The fit is right on for my Vernazza XL Supersoft, and my wife's Torretta, both different armrests, but a good fit for both. If I were ordering another chair, I would just order a set of these with the chair and save the time.