RRS® HA Long Lasting is a sterile medical device, Class Ill, made in conformity with Directive 42/93/EEC, dermal implant that contains cross-linked, resorbable Hyaluronic acid (HA). HA is solubilized in a protective buffer solution composed by amino acids with hydration and antioxidant properties that stabilize the HA. Hyaluronic acid is from biotechnological non-animal origin.