Yves Saint Laurent Top Secrets Moisturizing Prep Lotion. This lotion, which is enriched with hyaluronic acid and walnut leaf extract, turns into a light and luxurious texture upon application. Moisturizes the skin for up to 24 hours while refreshing and softening the skin. The product slides easily over the skin and is quickly absorbed. Can be used alone or as part of your daily skin care routine to prepare the skin before applying