I bought these for my sons' twin beds. They fit nicely and are very comfortable. They are used on a single futon mattress which over time has become compacted and not as soft. This topper extends the time they can use the eco-friendly mattress and both boys said that they love the toppers. 1 of the toppers has a 2-3" piece glued to the edge (so not solid like the other) but it does not seem to smell and looks firm enough to be unnoticeable. I hope it stands up to the wear and tear as well as the other twin appears it will.