I was in search of a camping mattress to fit in my pocket cruising sailboat (15ft), hence my purchase of this mattress. Being an overweight adult male, I was skeptical about the thickness (3in). But before returning, I figured I'd at least entertain a test of my intended use.
I did my overnight campout on the boat, and to my pleasant surprise, I was actually comforfable and slept pretty well. The low thickness also worked because the ceiling of my cabin was low, so it allowed just that much more head clearance.
That's not to say I have no problems. Though the thickness was sufficient, the length wasn't. It was advertised as 72in long. I'm 5'10 (70in) tall, so it should have been taller than me, but it wasn't. It was shorter. My only gripe was my feet hanging off as I lay down.
If I were to go through with returning now it'd just be to get the next size up.