A Queen Comforter or Duvet (typically 90 inches or longer) is often used to accommodate the additional height of a RAISED Twin XL bed. However, it is important to note... while you can use
a queen comforter or duvet on your raised extra long twin bed, your fitted sheet, mattress topper, and mattress pad MUST be twin extra long (twin XL).
Using a queen comforter or duvet now may save money over time because you'll only need larger sheets if you plan to move into a campus apartment with a queen size bed next school year.
If you already have a queen size bed, you're in the right place.
The average height of a twin XL bed is 25" on each side of your bed, maybe more with your mattress topper. The width of a twin XL mattress is 39". The standard height of a bed riser is 6" on each side of your bed.