Hair Mask Intensive Keratin Treatment Avena Proport 8 Intensive Treatment Mask Infused With Oat Extracts & Keratin. This formula nourishes, protects & gives natural shine to all types of porous & treated hair. Keratin formula is unique bond deeply nourishes the sensitive parts of the hair, without weighting hair down. Apply After Hair Wash, Leave In 5-10 Minutes.