The invention provides liquid cleanser compositions which contains fatty acyl isethionate surfactant products having at least 10 wt % free fatty acid and/or fatty acid salt used as the primary surfactant at a level at least 60 wt % of total fatty acyl isethionate and synthetic cosurfactants in the liquid composition. The key is to insure a specific combination of surfactant crystal modifiers so that the fatty acyl isethionate-containing liquid composition will be stable at low and high temperatures.