I have not been able to sleep in my king size bed for two years after I had surgery. I tried other toppers and I still woke up sore and with a backache. It came down to sleeping on a futon with a partially filled air mattresses underneath or sleeping in my recliner. Then I found the Ultra-soft Memory foam 2 inch Mattress topper and I am back in the master bedroom again. There was very little odor and within 8 hours, I was able to put the mattress topper on my king bed and sleep on it that night. The mattress topper was directly on the mattress, and then I had a microfiber mattress pad on top of it. It didn't take much to feel how good the topper felt. I heard from other people that memory foam mattresses were hot to sleep on. My husband and I only felt a little warmth on the first night, but now that has gone away. Even my husband who had hip replacement surgery said that he is sleeping better. He doesn't roll around as much as before. I wake up in the morning with no backache and rested. I would recommend this topper to anyone who cannot sleep on a hard mattress. I would definitely buy another one. My daughter has already asked me to get one for her bed. The next time I need another one for myself, I definited will buy another one. Maybe even try the three inch topper.