Skin Active Hyaluronic Acid Ampoule Sheet Mask. The fast-action sheet mask combines a potent derm active with a natural origin ingredient to re-plump the skin with moisture for skin that looks firmer in just 5 minutes. Hyaluronic acid is known for its hydrating properties, holding up to 1000x its weight in water. Watermelon is known for its fresh and super- quenching effect.