At Bed Lines Etc., we carry twin sleeper sofa sheets in in a durable 400 thread count,100% cotton . And since our twin sofa bed sheets are attached they will not fall off in the middle of the night. Our twin sheet set includes a fitted sheet with attached flat sheet, and one standard pillowcase, and fits mattress up to 6". We also offer the option of having them unattached if you like. Our twin sofa bed sheets fits mattress 36" x 72" x 6" Please make sure you measure your sofa bed, sleeper sofa, mattress to assure the right size. We also offer cotton mattress pads for your sofa bed. Our twin sleeper sofa mattress pads are made especially for sofa beds and don't look like the cheap ones you see elsewhere.