I bought a queen-sized four-inch memory topper and cut it into two halves to get two twin(ish)-sized toppers. I use one half on my bed at home, but that left me with another extra half. I've heard people talk about using memory foam toppers for camping, and so I've taken this topper out into the outdoors (car camping only) on several occasions as well.
The problem is, I've had mixed results. In cooler weather, the memory foam gets cold and hard and is only comfortable once you wait for the foam to warm up directly underneath you. If you move in your sleep, this can be disturbing, as you have to wait for the foam underneath you to warm up for it to be comfortable. This isn't a huge deal, but it's not as comfortable as the same topper at room-temperature.
In warmer weather, the memory foam loses its "memory" and just ends up being super squishy foam. I believe it retained heat (in the summer, not cooler weather!) more than I would have liked. Again, not as comfortable.
Has anyone else tried this? Is your experience different from mine? What am I doing wrong?