Definition & frizz control. Hair Length: All. The Look: Defined curls. The Best of L'Oreal Technology: A creation from the L'Oreal Laboratories, Studio Line Lasting Curls gel contains a special hair curling technology that adds shine, definition and hold to permed or naturally curly hair. The Result: Curls are defined, frizz free and full of life. Meets all state and federal VOC standards. Made in USA.