A standard twin flat sheet (typically 66 x 96 inches) or full flat sheet (typically 81 x 96 inches) will fit the coordinating extra long bed. If money is an issue, students needing a twin XL sheet set or full XL sheet set can always use their standard size flat sheet and pillowcase(s) from home then purchase the correct size XL fitted sheet (i.e. twin XL or full XL) to complete the set. read more