The masque will offer sustained hydration irrespective of how long it is left on the skin, but the longer the exposure time, the greater its benefits, and so we recommend overnight use. Sublime Replenishing Night Masque has been formulated with ingredients known for their hydrating and emollient properties, including Sodium Carrageenan, Niacinamide and Squalane, to offer a soft, non-greasy finish, helping to restore moisture and bolster the skin. Importantly, it has been developed to both boost moisture and strengthen the skin’s barrier function. Humectant ingredients, such as Saccharide Isomerate and Sodium Carrageenan, help to bind water in the skin; while nourishing emollients, including Squalane and Tocopherol, help to reduce moisture loss.