Twin XL Mattress
The XL size twin mattress is quite similar to the twin mattress only it is about five inches long. The overall dimensions are 80 inches in length (about 6’8”) by 39 inches. These mattresses are most often found in guest bedrooms and dorm rooms because they are excellent space savers. As mentioned above, taller adults who want a twin-size option may prefer the twin XL mattress because it adds the extra length to a sleeping space.