The 7-day Thalgo Source Marine hydration treatment provides immediate hydration immediately after application. Seve Bleue des Océans seawater, rich in marine manganese, strengthens the skin barrier and reduces water loss from the skin. At the same time, it restores water reserves and increases its exchange in the basal membrane. The filtrate of patented Micronized Seaweed supplies the skin with minerals and micronutrients that are essential for its proper functioning. The skin is revitalized and strengthened. The formula is enriched with a complex inspired by natural moisturizing factors and low molecular weight hyaluronic acid with high penetration into the skin. The fresh fluid provides a thirst-quenching effect immediately after application.