I use the product with our Sure-Fit armless cover.  They would pretty well except they do wiggle out once in a while when we recline the chair.  Easy to install with directions and the armless cover we bought has a place to insert them in the cover which is great.  I did order too many, but am using the extras on my other furniture that have covers and they are working our very well.  Keeps me from having to tuck in the cover every time I sit on it.