This beautiful mattress is handmade in Japan and I like that you can tell by the craftsmanship that it’s very good quality and it’s so comfortable and I love by the way it does come with an earthy grassy smell so just keep that in mind.It’s pretty good for your back and I don’t experience any sweatiness when using it so I’m not too hot not too cold.It’s a good thickness for using on the floor or as a mattress topper if you’d like.It’s flat enough to be stored away pretty easily if you triple fold it but you can’t quadruple fold that make sure you have enough closet space to keep it but otherwise it’s a very functional mattress.

This matters is awesome for several reasons.1)OPENS SPACE IN ROOM: it really opens the room up. i just kept seeing how much a bed swallows space in a room.i roll this japanese futon mattres into a makeshift sofa couch during the day. i've been loving having that space now.2) BETTER ON MY NECK AND BODY: I'm a 58-yr-old woman, and it's good for my back and body. It has been very comfortable. i don't have problems with tingling in my hips and thighs and shoulders/arms anymore like i did with a regular mattress. (and my formerr mattress was a pretty good quality).3) CLEANER FEELING:it makes me keep up with some better hygiene habits bc you are supposed to air it out 1x week (at the minimum hang over a chair, and better is when you can put it in the sun in the backyard or at a window). Because i sleep with it on the floor this makes me run the vacuum in my room 1x week also before putting the aired-out futon mattress back on the floor. so even though it's a little more maintenance thana regular bed I like it since airing it out makes it feel so clean. Plus, that gives me the structure and makes me run the vacuum in my room and change my linen (when before i didn't often enough ?).4) BETTER QUALITY SLEEP:i'm sleeping without having to wake up from pain and tingling in my legs and arms and without lower back pain. So i get deeper sleep and wake up more rested. plus because my sleeping space is cleaner and better maintained, I know that is helping my sleep and mental health.As far as thickness, like i wrote, it's very comfortable and good for my body.as far a heat retention, i haven't noticed this mattress holds heat (at least not any more than any "regular" mattress). I run hot (woman in late 50s) so I have found these solutions when i had a regular mattress that i still use with this futon mattress:a) i wash or at least rinse off in a quick shower at night, cool water at the end, to clean out poresb) run a fan and keep room temp cool,c) use 3 layers of sheets on top of the mattress (underneath me between me and the mattress) and 2-3 sheets layered with a blanket on top of me.

This futon mattress is incredible!! I actually find it more comfortable and supportive than my new, more expensive memory foam mattress. It's ideal for those with chronic back pain, especially if it's low back pain.After browsing tons of mediocre looking options for a guest mattress/sofabed/futon, I landed on this product and couldn't ignore the many positive reviews. So I went for it and found out that it's absolutely worth every penny. I recently had a friend stay at my new apartment and he was extremely satisfied with his sleeping arrangements, on the carpeted hard floor of my living room. Me? I was a little jealous!This mattress is thick, fluffy, soft, yet very firm and supportive, there was no strange smell, it's easy to open up (doesn't take long at all to expand), and it rolls up to store in your closet. The only issue for me is that even though it does roll up (with some effort), it's thick and it takes up a good chunk of space. It's totally hogging closet space right now and it doesn't really bend or fold into a smaller space, so if you have very limited space it could be an issue.The quality and comfort are amazing, the stitching is impeccable, and I'm considering using it as a mattress topper to improve the comfort of my own bed. It's really the best mattress I've ever tried! My back never felt better than when I was laying on it. It's one of the best purchases I've ever made off of Amazon, and that's saying a LOT. You won't be disappointed!