The Girls™ unique Blu-Tec Control System™ is a special trademarked fabric system, constructed with the highest quality yarns and just the right formula of nylon and spandex. After decades of producing women's clothing and studying precisely where women want more support, The Girls™ developed the Blu-Tec Control System™ to slim, shape and contour the body in just the right places. Found only in The Girls™ Tummy Control styles, this special power mesh system is discreetly placed inside the clothing invisible to the rest of the world so only you know it is there.