Jeanne Piaubert cosmetics. SEINS FERMES serum. Firming serum for the bust. This sophisticated treatment consists of specialized active ingredients to treat your breasts, giving them tone, firmness and preventing them from falling. The specific complex that will help to accomplish this task is the so-called "shape memory" which is what will keep your breasts slim and voluminous for longer. The result will be a toned, firm and revitalized bust. Apply for 4 weeks. You can distribute it in the morning or at night with a light massage to the entire chest.