A hair-treating agent is described which is preferably in the form of an optically clear, transparent or translucent product and which contains (A) at least one hair-care silicone compound having at least one hydrophilic group, (B) at least one nonionic, amphiphilic associative thickener containing at least one hydrophilic group and optionally (C) at least one hair-care substance having at least one cationic group, in a cosmetically appropriate base. The agent is used as a leave-in hair treatment or as a hair rinse, thus conditioning the hair and conferring to it gloss and volume.