Made an "emergency" purchase of this Sealy Posturepedic Summer Rose 12" Medium (tight top) due to a failed 80-day experiment with a "fad" bed-in-a-box mattress. Weeks of restless nights led to crippling back and hip pain each morning. I could take no more. Instead of that hard-as-a-rock foam mattress, I have returned to a traditional non-hybrid innerspring mattress (although most now seem to employ some amount of foam on top of pocket springs). I have slept on it one night. Seems a bit firm for a "medium" but time will tell. Also, a bit of a stretch to claim it is 12" tall. Mattress measures 10" from base to top seam. Slightly puffy top adds no more than an inch, so maybe 11" maximum, which was disappointing. I did note I slept a bit sounder last night and had less back and hip pain in the morning. Thank you, Sealy.