Q: Can you help me find a fairly lightweight folding mattress (no bed frame). I'm staying with someone in a tiny studio, and need to just be able to fold up a mattress (kind of like a folding mat — you usually fold it in thirds). I'm looking for one that's eco-friendly and avoid toxic, plastic-types of sleeping mattresses. Something pretty basic as I often sleep on floors, but I'd like it to be comfortable, too. Any thoughts? Asked by Elina Editor: This is a good question. From what we've found, you may want to check out this Tri-Fold Memory Foam Mattress from Rocky Mountain Mattress. It starts at $249 and comes in three sizes. It has a 100% cotton cover and the mattress is made with Foamex® which uses natural plant-based ingredients in place of the traditional petroleum based ingredients normally used by other manufacturers. It's also processed in such a way that close to zero emissions are released into the environment during the manufacturing process. You can read more about Foamex® here. Also, read a review of the Tri-Fold Memory Foam Mattress here. (It's pretty good!) Anyone else have any suggestions?