Isntree Clear Skin PHA sleeping mask removes dead skin cells overnight while quenching skin dehydration. PHA serves as a mild exfoliator and hydrating agent, providing surface-level exfoliation which does not stimulate irritation and preserves moisture. This soft, creamy mask is extremely hydrating containing Natural Moisturising factors and milk extract. It absorbs and attracts water molecules simultaneously preventing the evaporation of moisture from the skin. Despite being a hydrating mask, this product is lightweight and non-sticky which can be comfortably worn during sleep.