This mattress is incredibly firm but super comfortable! I bought one for my son and while he was at school, I tried it out and actually ended up taking a nap because it was SO comfortable! But I think that 'firm' is comfortable.  If you want something a bit more squishy, this is probably not for you. But if you want a truly firm, comfortable mattress, I highly recommend this one. I will be purchasing one for myself and getting rid of my sleep number! I have terrible lower back problems and this is the perfect mattress for me.