I have an extra firm, stern and foster in my house, and I was unable to sleep at my boyfriends because the bed was miserably soft at a medium firm …. Told him I wouldn’t sleep there unless he ordered this bed because of back snd hip issues. I now seriously like this bed more than my $3000 SnF bed!!! it’s rock hard! Some people might need a topper bcz it’s to firm, but I prefer this way. We even did the test where we lay directly next to each other and rolled around to make sure that we did not taco and roll into the other person or sink… I hate feeling like the bed is drowning me. But Not at all!! It’s fantastic!