Good cushions for Adirondack chairs. There is a sturdy elastic strap that slips over the back. The fabric is ideal for outdoor use, but it isn't a removable cover so it's spot cleaning/wipe down only. Since it's easy to slip on and off, I'd recommend not leaving them on when not in use unless you have your chairs in a covered space. It's standard size for Adirondicks but be sure to measure your chair, to be on the precise and cautious side. Recommended.