The rheology and dynamics of giant micellar solutions have attracted special attention because subtle changes in surfactant, cosurfactant, temperature, added electrolyte, and counterion can produce enormous changes in dimensions, flexibility, and interactions. 1 Since giant micelles exhibit shear thickening in the dilute regime, strong viscoelasticity, high viscosity at low shear rates and shear thinning at higher concentrations, they have been commercially used as drag-reducing agents, in home and care products, and in oil field applications (see Chapters 15 to 18 in this volume).