Soft yet supportive
Serta has the Stay listed as right between soft and firm on their scale but I'd say it leans towards the softer side, it's the type of mattress where you instantly sink and it molds to your body but it still feels very supportive through the night. I feel like mattresses are definitely personal preference, what's too hard or too soft for one person might be perfect for another but for me this was just about perfect. It's soft yet supportive and I don't have any of hip pain and leg numbness I experience with firm mattresses. Other than comfort, there were two things that stood out about the Stay to me, the first being the 4 layers of foam. The top layers give it that cushy sink in softness and the lower layers keep it supportive. If you press down hard enough especially at the edges you can feel the change in firmness. The second was the cover, it's soft and cottony and here's the big plus, it unzips all the way around (there's about an inch that does not unzip). I haven't tried it yet but it seems like it will remove completely for washing and underneath the mattress is covered with a cottony blue fabric. I have a 3-year-old and accidents happen so I'm probably overly excited that it seems to be removable and washable. It's a simple thing but it's a game changer and I can't believe all mattresses aren't made this way! Set up is fast and easy. The king box is roughly 21"x21"x46" and shipping weight showed 127 lbs, small enough to fit easily in a trunk and while heavy I was able to drag it in and set it up alone. Definitely get it on the platform or box spring before opening. It expands quickly and will be the full 12" within minutes. There is a minimal smell from the memory foam which I expected, it dissipates pretty quickly but I did open a window for a few hours to help air it out.