I was super skeptical to buy a mattress online, sight unseen, as most people I’m sure are. I’m so glad I took the risk! I read tons of reviews on many different mattresses and found this one to fit my needs. I purchased it with a platform bed that didn’t require a box spring and the 12” height is perfect. It came all rolled up in a box and after freeing it from it’s packaging it inflated in no time!  It probably took two minutes. And no chemical smell! I can’t really say it’s cooling. I’m a hot sleeper and during the summer months it didn’t seem to help much but other than that it is so comfortable! The first couple of weeks it seemed a bit firm but either we broke it in or adjusted to it. I sleep a solid 8 hours on this thing. It hasn’t sagged at all since we got it. Great purchase!