I got this mattress for a day bed in my guest room. It’s supposed to expand to 10” but I’m pretty sure it expanded to 6-7” max, which is disappointing. I suggest ordering a few inches greater than what you need just in case the mattress doesn’t expand to its full height.

But even so, I’ve had one guest sleep on it who said it was comfortable. I’ve only sat and laid on it briefly and I found it to be comfortable.