Did a bit of research and bought a king for myself and a queen for my mom. Unboxed and unrolled in living room as directed and left it there for four days. About 12 hours in my whole house smelled toxic (and I live in a large house). I opened windows and hoped I wasn't developing a lung tumor. After the four days, I dragged it myself to the bed (it is flippen HEAVY) and put it on. Couple of things to remember - make sure the carpet is freshly vacuumed where the pad is going to unfurl. Otherwise, you will have every cat/dog hair, fuzz or whatever else clinging to your new purchase. Second thing to think about - if you are kinda wimpy, as myself, and plan on dragging this beast to your room alone, know that it will TEAR. After a lot of lugging and sweating and a few choice words, I got it on my bed and thanked my mom silently again for the deep pocket sheets she gave me for Christmas. They worked like a charm. You can not get regular sheets on top of this bad boy. The first week on the bed made my eyes and nostrils burn and it wasn't fun. Now, it's been a few weeks and I occasionally can still smell those lovely fumes coming from the pad but it's getting much better and maybe even tolerable. Now to the 5 stars -now I don't wake up and wonder why I feel like an 89 year old man, when in fact I am a healthy and active 38 year old woman. Now I wake up, roll over and only groan because I think it's too early, not because my body aches. My husband's only complaint is, he can't freely roll over. He says it feels like he's stuck in mud. I say don't roll over and enjoy your youthful body! Ha!