A fluorinated composition includes: a polyfluoropolyether silane represented by the formula: RfaO(CF(CF3)CF2O)pCF(CF3)CH2OZ1Si(Y1)3; and a polyfluoropolyether silane represented by the formula: Rfb[R5CH2OZ2Si(Y2)3]2 Rfa represents a perfluoroalkyl group having from 1 to 12 carbon atoms, optionally substituted with at least one catenated oxygen atom or —NR8— group, wherein R8 represents a perfluoroalkyl group; Z1 represents —R1SR2—, —R1S(═O)R2—, or —R1S(═O)2R2, wherein R1 and R2 independently represent alkylene groups having from 1 to 12 carbon atoms; each Y1 independently represents a hydrolyzable group; and p is a number in a range of from 3 to 50; Z2 independently represents —R3SR4—, —R3S(═O)R4—, or —R3S(═O)2R4, wherein R3 and R4 independently represent alkylene groups having from 1 to 12 carbon atoms; Y2 independently represents a hydrolyzable group; Rfb represents a perfluoroalkylene group having at least 3 carbon atoms, optionally substituted with at least one catenated oxygen atom or —NR6— group, wherein R6 represents a perfluoroalkyl group; R5 independently represents a covalent bond, or —(OR7)b—, and wherein R7 independently represents a branched perfluoroalkylene group, and b independently represents a number greater than or equal to one.