A twin XL bed frame is designed to fit twin extra-long mattresses. Both twin XL and regular twin mattresses have a width of 38 inches, but a twin XL has a length of 80 inches, which is 5 inches ...

Keep in mind that with twin XL mattresses, you'll also need to find specialty bedding and a longer bed frame, which can increase expenses. Your sleep position should also play a role in which ...