The inventions relates to stable cosmetic compositions preferably hair treatment compositions, comprising

• a) from 0,1% to 70% by weight of at least one anionic surfactant
• b) from 0,05% to 10% by weight of at least one cationic surfactant of the formula (1) ##STR1##
• Wherein

  R¹ is selected from the group consisting of (C₈-C₂₂)-alkyl, (C₈-C₂₂)-alkenyl, (C₈-C₂₂)-alkylamidopropyl, (C₈-C₂₂)-alkenylamidopropyl, (C₈-C₂₂)-alkoxypropyl and (C₈-C₂₂)-alkenyloxypropyl,

  R², R³ and R⁴ are the same or different and are independently from each other selected from the group consisting of (C₁-C₂₂)-alkyl, (C₁-C₂₂)-alkenyl and groups having the formula —A—(AO)_n—OH, wherein A is C₂H₄ and/or C₃H₆, n is a number from 0 to 20, with the provision that at least one the radicals R², R³ and R⁴ is a group having said formula —A—(AO)_n—OH, and X is an anionic; and

• c) optionally from 0.1% to 15% by weight of one or more amphoteric and/or nonionic surfactants.