From J. Queen New York, this sheet set features:  Featuring Royal Fit technology, a patented design, which guarantees to fit every mattress perfectly, every time. The unique fitted sheet construction stretches to fit the deepest mattress, mattress toppers, and works great with smaller low-profile mattresses (7" - 20"). Unlike most fitted sheets that do not fit well or stay in place throughout the night, our fitted sheet solution will never shift or slip off. Cotton 300 thread count machine wash Twin set includes:  Twin sheet set approx. 75" x 39" Flat sheet approx. 96" x 71" One pillowcase approx. 30" x 20" Full set includes:  Full sheet set approx. 75" x 54" Flat sheet approx. 96" x 86" Two pillowcases approx. 30" x 20" Queen set includes:  Queen sheet set approx. 80" x 60" Flat sheet approx. 104" x 96" Two pillowcases approx. 30" x 20" King set includes:  King sheet set approx. 80" x 78" Flat sheet approx. 104" x 108" Two pillowcases approx. 40" x 20" California King set includes:  California King sheet set approx. 84" x 72" Flat sheet approx. 104" x 108" Two pillowcases approx. 40" x 20" Imported.