Durability of oleophobicity imparted to cotton fabrics by additive finishes (perfluoro-metallic complexes and perfluoro-acrylate) and by the incorporation of fluorochemicals into the cellulose molecule by means of an ether linkage has been investigated. Studies on the relative effectiveness of additive finishes in maintaining oleophobicity on weathering have been made. Results of soil burial tests involving the use of aluminium triacetate and perfluorooctanoic acid on various fabric contructions are reported. Various techniques used in efforts to improve durability of the latter finish to aqueous launderings are described. Data are presented to explain losses in oleophobic properties when fabrics treated with perfluorooctanoic acid complex of chromium or aluminum are subjected to aqueous launderings. The preparation of 1, 1-dihydroheptafluorobutoxyhydroxypropyl and 1, 1-dihydropentadecafluorooctoxyhydroxypropyl ethers of cellulose which possessed hydrophobic and oleophobic properties durable to alkaline acqueous washings and commercial drycleaning solutions are described. The preparation of 1,1, 7-trihydrododecafluorheptoxyhydroxypropyl ether of cellulose which possessed only a small degree of oil repellency due to the presence of an omega-hydrogen atom is also given.