I took a risk. I had odd measurements for my sofa bed and this mattress (along with anything else I could find at a decent price) was a couple inches too long. But I decided to try it out anyway, and just hope it could stuff in my couch ok. I was so thankful to find that it fit! The slight measurement difference didn't affect its ability to fold up nicely. Now I have a very confortable mattress for an affordable price. No regrets!