This velvety sleep mask is formulated with 15 mineral rich thermal spa water and hyaluronic acid to work its magic while you sleep and leave the skin feeling brighter soothed refreshed and plumper tested on sensitive skin under dermatological control hypoallergenic paraben free to use apply a think liberal layer to the face and neck area before bed and gently massage into the skin allow to soak in overnight should be used 1 2 times per week