While I agree with the other reviews that the non-slip bottom is fairly useless on wooden chair surfaces, I've found that to be the case with every non-slip chair pad I've tried. They do slide less than what they would without any backing, but there is definitely movement. As far as quality goes, these are terrific seat cushions. As others have said, they are thick (3") and oversized (17" long and 18" at the widest part in the front.) I was looking for a larger size, so they fit my chairs perfectly. I do hope they'll flatten out just a little, though, since they are quite high on the chair. Be warned: they are not very soft. I'd say they're more to protect the chair than to cushion one's backside! I got the khaki color and worried that it they would come looking very "Army", but they are actually quite nice...a bit lighter than in the photos, which is what I was hoping for. I think I'd call them more olive than khaki. In sum, I highly recommend these. I only gave them 4 stars because of the non-slip issue, but in reality I'd rather give them a 4.5 rating.