I was very disappointed to say the least
Unfortunately, this product does NOT fully cover the width of a twin bed frame.  Product is missing about 3-4 inches on each side in order to fully cover it.  I had to place the product in the middle which defeats the purpose that I was hoping for which was 100% support/coverage for my twin bed mattress.  I was very disappointed to say the least, but I didn't return it because for the time being...it's better than nothing.
Rating: 2 stars