ZINUS 10 Inch King Size Cooling Copper Hybrid Mattress - Adaptive Pocket Spring, Moisture Wicking Cover & Cooling Foam for Motion Isolation - Mattress in a Box - Perfect for Hot Sleepers & Couples

I spent over a year researching bed-in-box mattresses and this was the one I just kept coming back to because of the price for a hybrid King. I wanted a hybrid mattress that was at least 10 inches with a medium-firm feel. This fits the bill.Shipping time was the killer for me. I actually bought this mattress in August and waited two months for it to ship. Then when it finally did another two weeks passed before I had to get on the phone with ...Amazon, the shipping distributor, and then finally the shipping receiver to find my mattress. Apparently it became lost in transit, but I will say, Amazon was quick to replace and scheduled a new one to be delivered by the end of that week. My personal problem was that it was now arriving during a time that my fiancee would be gone for a work trip. I'm only 98 lbs and the box weighs as much as me. I ended up having to leave it in our living room against the wall for 3 weeks until he returned.Now it does say on the side of the box to open within 3 days. I was very nervous about this but my worry for nothing because it opened and expanded perfectly after sitting in a box for 3 weeks. Within 30 minutes it was practically full and we were trying it out. We did not sleep on it the first night but let it get that full 24 hours to expand. There were no odd smells from opening the bed.It's been 2 weeks or so since we started sleeping on this new bed. It is firm. I can feel the first foam layer and it molds to my body only slightly. I honestly don't like firm mattresses ... but my fiancee loves them so he really likes how firm this bed is. With that said I don't mind the firmness and have had some great nights of sleep. You could certainly buy a 2 or 3 inch memory foam cover for this bed and I think that would be good for those who want a little more cushion. Or get the 12 inch. I'm not sure about the cooling feature - haven't noticed anything - so I'll update later on.PROSIf you like firm - this is FIRMExpanded very fastPriceCONSThe box is so heavy - highly recommend getting delivery to room if possibleEdges are not the greatest if you're more than 200 lbsFiber glass (Just don't remove the cover..)1 YEAR UPDATE: Changed from 4 Stars to 5 Stars!!As I mentioned previously, I am not a fan of firm mattresses but I have loved sleeping on this mattress over this past year. I am definitely less sore waking up in the morning. Did not purchase a topper. It has such a nice cushy feel while still being firm. And it has kept that same feeling over the course of daily use this past year.The cooling feature does work! We live in Florida and during the summer we sweat a lot. I noticed a difference right away in that our sheets don't nearly need to be washed as often. We are staying cooler and sweating less. I don't necessarily feel that the mattress is cool but I know that it's keeping our body heat at a cooler temperature.There has been no indents and I haven't felt the need to flip the bed top to bottom. I am very happy with this hybrid mattress. So much so that I remembered to come back and update this review!