I have an older platform bed that probably needs replaced soon.   My daughter sleeps on the bed so I’m waiting to upgrade when she’s older.   I wasn’t ready to commit to a whole new mattress.  With no box spring it can become kind of uncomfortable.  I purchased this as a way of extending my mattress life.   It is like sleeping on a cloud !  I was shocked when it arrived at how small the box was.   I unrolled it and it fit perfect.   I have a full size bed and it fit very well.   I usually fall asleep with my daughter before going to my room and I can tell a significant difference.   She also has been sleeping better at night.   Eventually I’ll have to buy a new mattress but this topper is great for the time being and has made sleeping in this bed a much better experience.