The King Size we ordered has stayed very fluffy and comfy. The Full Size became flat within the first week and wont fluff up. I requested a replacement, because it must be a defective one since the King Size is so nice. Hopefully the replacement for the full size will be better. We are using the king size on two Chattahoochee Convertible Chairs that we have set together as a king size lounger. We are also using 4 inch memory foam topper just under this down alternative topper. With the chairs set up as a lounger instead of flat bed, it does slide a little but not bad. It feels amazing with these toppers. We just sink down in it! Very comfy for both me and my big dog, and we both have severe joint problems.