Shopping bag.

Julia Restoin Roitfeld could write the book on French girl chic. With her distinct Parisian inflection and the kind of effortless, easy-going style that feels both elevated and practical, she’s the very walking, talking, living, breathing epitome of it. But perhaps if you grew up on the front row in the French capital, you might be too. Restoin Roitfeld is the daughter of Carine Roitfeld, the empress of bi-annual style tome, CR Fashion Book. Her dad, Christian Restoin, is a business entrepreneur. Restoin Roitfeld had her portrait snapped by fashion’s most illustrious photographers before she was ten, appeared in fashion shoots as a teen, and—come adulthood—moved to New York City to work as a creative director, model, designer (most recently for The Outnet), slash full-time mom to her daughter, Romy Nicole—now eight.

Fashion devotees with a conscience will enjoy her approach: She preaches not about abstinence, but rather of indulging in the best of what we need. “I am hoping that with this new journey, I will be able to encourage a more essential lifestyle, while educating myself on how to be sustainable, conscious, and minimal yet still enjoying life’s pleasures,” she writes in her site’s manifesto. “In the end we don’t actually need that much ‘stuff’…Let us put import on quality over quantity and on experiences over things.”

This week, Restoin Roitfeld is bringing her sartorially strategic A-game to Semaine, with a very special ski presentation in collaboration with California-based performance brand, Matek. It’s a natural fit: Matek is a new—and niche—winter sports apparel brand with its sights set on safe-guarding the future of the natural world, while designing flattering clothes that you’ll feel sleek, polished, and chic in. The brand extensively uses a fiber called Repreve in its collection, which is made from recycled materials, including just some of the billions of plastic bottles that wind up in landfills every year. In addition, Matek makes buttons from palm tree nuts and its hang-tags are water soluble.

Along with practical tips on how to actually ski, (“The three ’S’s are key—Stability, Speed, and Stopping”), Restoin Roitfeld is also on hand this week with a surplus of ideas to help Semaine readers successfully navigate the slopes to more sustainable and gratifying shopping practices. To start, you have to learn the basics—which for Restoin Roitfeld include layering responsibly, seeking out secondhand and vintage, and buying things you’ll want to cherish forever, not wear just once on a whim. The second step is much like the first: Veer away from trends and take utmost care of the things you do decide to purchase. To top it off, Restoin Roitfeld has also shared her alpine address book. Scroll through for pointers on how to recreate her iconic ski look, and so much more.