From website: A water-friendly top that works like a binder but doesn’t feel like one (phew). Move and breathe with ease, wherever you go Fit Comfortable lightweight compression for all-day wear. Perfect For Support with a smooth minimized bust silhouette. Fabric Shell: Polyester/spandex jersey Front Lining: Specialized soft compression nylon/spandex Back Lining: Nylon/spandex power mesh Care Hand wash and line dry.