Mango Butter Cream at Ligne St. Barth While almost every international luxury brand has a boutique in Gustavia, I greatly prefer local shops. One of the best is Ligne St. Barth, a skincare and cosmetics company that was founded by Hervé Brin, descendant of one of the oldest families on the island. Working with his German wife, Birgit, he produces an excellent line of all-natural lotions and suntanning creams as well as a variety of products made from purified seawater and Caribbean fruit and plant extracts. The products are beautifully packaged, they work, and it seems that everyone in St. Barths appreciates them. Two favorites are the Mango Butter Cream moisturizer and the SPF 30 Roucou Sunscreen Lotion.