Lovesac ' SuperSac ' Size Cover - Chincilla Dense Phur. Description Enjoy Cloud-Like Comfort When you sink into a Sac for the first time, you’ll wonder how you ever lived this long without one. Whether you’re watching the game, taking a nap, or lounging around with a good book, a Sac is always the best seat in the house. Our three-density, proprietary blend of repurposed Durafoam™ makes each Sac airy, lofty, and cloud-like. When you have such a comfortable seat, you’re going to want to sit in it. A lot. We say go for it, because no matter the kind of living you do on your Sac, it will always look as good as it did on day one. For all of these reasons and more, Sacs are The World’s Most Comfortable Seat™.