I ordered an 8” medium and it’s the hardest mattress I’ve ever laid on. We first tried it without a box spring for a more streamlined look and I woke up sore and stiff in my back, knees and hips for the first time at 36years old. Got a box spring and noticed no difference. We previously had a memory foam mattress that was firm. I’m 175lbs and maybe left a 1 inch indentation in the mattress. No I have to figure out how to box this mattress back up to return it. I was also not used to feeling someone move in the other side of the bed either, I thought it would transfer motion a lot less being so firm.