A hyaluronic acid sheet mask.Achieve a healthy and hydrated complexion with the Oh K! Lactic Acid Sheet Mask. This biodegradable sheet mask comes with a powder sachet of sodium hyaluronate (hyaluronic acid); which stops the formula from oxidating and being less effective. Also enriched with ceramides to help retain moisture and protect the skin from environmental stress; this sheet mask will help to hydrate even the driest of skin; for a fresh and healthy result. Crueltyfree Vegan