Every Juvederm soft tissue fillers like Ultra XC and Ultra Plus XC were made using what's referred to as Hylacross technology. This manufacturing method placed hyaluronic acid compounds and strands of equal molecular weight and length within the gel base. The strands are linked up in a cross-weave pattern known as cross-linking. What this accomplished was to create more space between the strands of hyaluronic acid that drew in water molecules. The longevity of these Juvederm fillers is about 12 months.
Juvederm Voluma XC is made usng Vycross technology. This manufacturing method includes the use of various molecular weights and HA strand lengths, resulting in a tighter cross-link pattern and less space in which to draw in water. The tighter cross-linking of Voluma gives it more structural viscosity, making it ideal for contouring areas of the face like the cheeks and chin. It also extends its lifespan to up to 24 months.