Curl.Life Defining System by Matrix defines curls as it adds volume to Normal to Fine hair or controls volume for Thick or Coarse Hair. Curl Life Defining System by Matrix give curls lasting definition, shine and bound. Curl Life Defining System by Matrix has a unique technology that fues moisturizers and curl-defining stylers into every step to create perfectly contoured, frizz-fre curls. Curl Life Defining System by Matrix has everything a curl needs from shampoo to styling.