For desirable hair styles, both stiffness and flexibility are necessary – but the two properties are generally considered incompatible.
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Socially, diversity is increasingly valued and hair styling is an essential part of expressing oneself. To maintain a desired look, sufficient stiffness is required to hold hair in place throughout the day, even after vigorous activity. Without some level of flexibility to relieve stress forces, though, the style is easily broken and difficult to repair. Thus, for desirable hair styles, both stiffness and flexibility are necessary – but the two properties are generally considered incompatible.
