Abstract: A composition for hair treatment comprising at least two compositions (A) and (B) that are kept separate until application and that upon mixing increase in viscosity while generating heat, wherein one composition (A) comprises an essentially anhydrous mixture of a physiologically compatible salt that generates heat when mixed with water, and at least one thickening agent, and composition (B) comprising at least one polyalcohol that is liquid at 25.degree. C. and is selected from the group consisting of polyethyleneglycol, polypropyleneglycol, glycerol and diglycerol and, optionally, additional hair conditioning. A process for hair treatment, wherein composition (B) is first mixed with water and then blended with composition (A), whereby, while generating heat, a viscous gel develops that is applied onto the hair where it provides an enhanced conditioning effect due to improved penetration at higher temperature.