Just got my new wonderful mattress from Knox Foam. First time out, I used an air mattress, which while quite comfortable sleeping, was like a roller coaster when trying to get dressed or even just getting into bed. The new mattress is 3' and medium firm grade. After I ordered, I had second thoughts about it not being thick enough. Its very comfortable and I don't hit bottom. I'm a small person so someone else might need a thicker pad. It is also costom cut. Atwin was too small and a full was too big. I made it a simple cover with some leftover heavy fabric and used velcro to close it up. I'll probably use a eggcrate topper on it. Looking foward to comfortable nights and not fighting with my mattress. Cheaper, lighter, and fits better than the Wallyworld mattress.