I've been searching for quality chaise lounge cushions for some time and was happy to find these Fortenberry cushions because they provide a lot more cushion and have the extra security of the pocket that fits over the back. There are ties in the middle but not at the bottom and they have a non-slip feature that doesn't actually prevent slipping. While reading the reviews before purchase, one customer claimed they have zippers to remove the cushions inside for washing but they do not. But I am very happy with the fit and they look great on these types of chaise lounge chairs. I would recommend this cushion.