Your fitted sheet is worn out but the flat and pillowcases still new! It's very common that fitted sheet wears out much sooner than flat sheet and that is due to that fact that fitted sheet is subjected to body and feet friction much greater than flat sheet. Our Luxury Eucalyptus Top Split King Fitted Sheet woven at 600 Thread Count of 100% Eucalyptus Tencel Lyocell fabric from Eucalyptus trees gives you the option to just replace only what you need.
Top Split King Fitted Sheet 78 inches wide X 80 inches long Split from the middle top portions with 6 corner pockets made to fit up to 16 inches deep.
We have a top slit king bed and this sheet is enormous.
Follow-up by Egyptian Linens:
all our sheets are over cut by 2-3% so they keep on fitting mattress after few washes .