Includes 1 serum; There is no sidedness to the mask, and either side can be used effectively. Leave the mask in place for a minimum of 30 minutes, and for a recommended 1-2 hours.; For increased soothing and anti-inflammatory action, many clients enjoy refrigerating their mask prior to use.; In the unlikely event that you experience any discomfort or itching during the initial few minutes of mask application, you are advised to discontinue use.; KEY INGREDIENTS: Mixed Molecular Weight Hyaluronic Acid: a powerful humectant that attracts and retains moisture, providing deep hydration and a plump, youthful look. Vitamin B3: enhances barrier function, reduces the appearance of fine lines and wrinkle; Made in USA