Our barstool covers are one-size-fits-most (shown on a bar stool with a 13" diameter top). There is an elasticized reverse for an adjustable fit.
The cover is cushioned with a thick layer of polyester batting. If you want more padding, you can always insert a circle of foam between the cover and the top of the stool.
These covers are made-to-order, so please allow six weeks production time.