SKINFOOD - Sous Vide Mask Sheet- Kale. This is a sheet mask that contains kale extract, which is rich in vitamins and antioxidants. It can help hydrate and brighten your skin, as well as protect it from environmental damage. Some people say that it is a good product for dull and tired skin. This sheet mask's formula has an essence texture and is contained in a thin and lightweight cellulose fabric. This fabric perfectly fits and adheres to the face, helping to deliver all of the product's benefits to the skin. In summary, this mask refreshes the skin, providing a boost of hydration and helping to maintain a natural glow. How to use Apply SKINFOOD Kale Sous Vide Mask Sheet onto previously cleansed and toned skin. Adjust the mask to the face and press it, in order for it to adhere to the skin. Leave it on for 10 to 20 minutes. Remove the mask and gently massage the skin to help the remaining product absorb. You can also apply the excess product left on the mask onto the neck area.