Hair treatment compositions, including at least one quaternary imidazoline derivative having at least two long fat residues of the formula (I) set forth herein, in which the R1 and R2 residues are each independently a saturated or unsaturated, linear or branched hydrocarbyl residue having a chain length of 18 to 30 carbon atoms and X— is an anion, at least one amine and/or a cationized amine and at least one esterquat, are enhanced when they additionally include poly(2-methacryloyloxyethyltrimethylammonium chloride) (INCI name: Polyquaternium-37) to improve combability, shine and elasticity.
