I ordered the 79" size bolster, and it fits perfectly on my twin size day bed. I bought my 11 year old a day bed for her toy/hang out room. We thought we would get away with several pillows on the bed, but quickly found out the bed is too wide for that and the pillows, even though stacked several deep, were not doing the job. It was impossible to get comfortable when trying to use the daybed as a couch. We searched for a bolster big enough to cover the whole back of the day bed, and there were very few to pick from. I was concerned with spending the amount of money I did on this, but the reviews were VERY good, and I figured if it did the job, it would be worth it. This pillow is worth every penny! We can now very comfortably use the day bed as a couch when needed, because the bolster is thick enough and comfortable enough to use and feel support, unlike the pillows that were stacked. If you are on the fence about purchasing this pillow, you will not be disappointed! The color is perfect, it is so comfortable, not too hard or too soft, its just the right size, and it looks beautiful on the day bed!