New in plastic;unopened Saint Laurent Silk Face Mask 100% SILK YSL Rive Droite (This item is RARE and no longer sold at YSL-Now Vintage Item) Purchased from YSL Online *Authenticity Guaranteed* comes with the box as pictured. 100% Silk Fabric Documentation: UC researchers found that silk creates the most effective barrier compared to other fabrics like cotton or polyester because it repels moisture. When opting for a mask made from silk, you'll benefit from the cool and breathable properties of the fabric. It's incredibly lightweight which makes for a more comfortable wear with ease of breathing, and without trapping the hot moisture from your breath inside it.