The pockets on the fitted sheet would probably cover two regular matrasses; it is easy to put on our 17" matrass which was my primary need.  I hate struggling with a fitted sheet that was described as "deep pockets;" "fits matrasses to 18 inches" when it really doesn't.  The linens are not "light" weight and not "heavy," either as my husband complains about "heavy" sheets.  These are perfect!  Absolutely wonderful!