Double Serum by Clarins. The most recent advances from Clarins Research. The ultimate age-control, anti-wrinkle, extra-firming skin care treatment. 2 age-defying formulas in 1 groundbreaking serum. Thanks to its dual-phase formula which provides the most effective concentration of plant extracts. Reactivates skin's 5 vital functions: hydration, nutrition, oxygenation, protection and revitalization. Day after day, skin is firmer, replenished, more youthful-looking and the complexion appears more radiant. The best of nature and science.