I purchased this topper to turn my two twin guest beds into a king. I hoped it would make the gap less painful. The product was shipped quickly and arrived very flat, but quickly puffed up. I thought it was very comfortable after about an hour of lying on it to test it. Although I could feel the gap, I wouldn't say it was particularly noticeable. I'm very pleased with my purchase and know that my guests will feel at ease using it. By the way, it has no odor like those foam toppers and can be easily stored. This is a product I would recommend!