I believe these sheets are for huge mattresses - not for regular size. That info was not listed. And I bought these because thought they were for standard mattresses. Therefore, the sheets stretch out after one use after wash... The sheets slip all over the place on the bed. The pillow cases do not fit standard pillow size - too small.  The ends of my pillows stick out. You need to have the pillow case actually be larger than standard pillow size, not BE the size of standard pillows.