A composition comprising: (i) 0.01 to 10 wt % of a linear cationic conditioning primary surfactant; selected from structure 1 and mixtures thereof: wherein: • R 1 comprises a linear alkyl chain having a carbon-carbon chain length of from C 16 to C 24, preferably C 18 to C 22; • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; and • X is an organic or inorganic anion; (ii) 0.1 to 10 wt % of a linear fatty material; (iii) a particulate benefit agent selected from conditioning actives and mixtures thereof; and (iv) 0.01 to 5 wt % of a linear cationic co-surfactant, selected from structure 2 and mixtures thereof wherein: • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; • R 3 comprises a linear alkyl chain comprising an ester group and having an atom-atom chain length of from 3 to 15, preferably 10 to 14; and • X is an organic or inorganic anion; wherein the carbon-carbon chain length of R 1 in structure 1 differs from the atom-atom chain length of R 3 in structure 2 by at least 3 atoms, such that the atom-atom chain length of R 1 in structure 1 is longer than the atom-atom chain length of R 3 in structure 2; and wherein the molar ratio of linear cationic co-surfactant (iv) to linear cationic conditioning primary surfactant (i) is in the range of from 1:20 to 1:1. (i) 0.01 to 10 wt % of a linear cationic conditioning primary surfactant; selected from structure 1 and mixtures thereof: wherein: • R 1 comprises a linear alkyl chain having a carbon-carbon chain length of from C 16 to C 24, preferably C 18 to C 22; • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; and • X is an organic or inorganic anion; • R 1 comprises a linear alkyl chain having a carbon-carbon chain length of from C 16 to C 24, preferably C 18 to C 22; • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; and • X is an organic or inorganic anion; (ii) 0.1 to 10 wt % of a linear fatty material; (iii) a particulate benefit agent selected from conditioning actives and mixtures thereof; and (iv) 0.01 to 5 wt % of a linear cationic co-surfactant, selected from structure 2 and mixtures thereof wherein: • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; • R 3 comprises a linear alkyl chain comprising an ester group and having an atom-atom chain length of from 3 to 15, preferably 10 to 14; and • X is an organic or inorganic anion; • R 2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C 1 to C 4, preferably C 1 to C 2 or a benzyl group; • R 3 comprises a linear alkyl chain comprising an ester group and having an atom-atom chain length of from 3 to 15, preferably 10 to 14; and • X is an organic or inorganic anion; wherein the carbon-carbon chain length of R 1 in structure 1 differs from the atom-atom chain length of R 3 in structure 2 by at least 3 atoms, such that the atom-atom chain length of R 1 in structure 1 is longer than the atom-atom chain length of R 3 in structure 2; and wherein the molar ratio of linear cationic co-surfactant (iv) to linear cationic conditioning primary surfactant (i) is in the range of from 1:20 to 1:1.