Matthieu Barret's Brise Cailloux Blanc is a white wine from the Côtes du Rhône region, specifically the Cornas area. It's a blend of Marsanne, Roussanne, and Viognier grapes. The white version of Brise Cailloux offers a different expression of the Cornas terroir, showcasing a vibrant, mineral-driven style with a cool and refreshing taste. It is known for its drinkability and verticality, which are not typically found in Southern Rhône white wines.