Sebastian Professional Penetraitt Overnight Repairing Serum is a leave-in treatment with a unique combination of ingredients suitable for damaged and dry hair. This repairing serum contains hyaluronic acid and niacinamide that deeply penetrate, hydrate and repair. Wake up with hair that looks soft, supple and hydrated, ready for unlimited styling. Use together with other Penetraitt products that penetrate the hair and protect against stress caused by chemicals and heat damage. The Sebastian Professional Penetraitt series is a strengthening and repairing series perfect for you with stressed, damaged and color-treated hair. This deep-acting range of products protects the hair against stress caused by chemicals and heat damage and makes the hair shiny and strong with a silky finish.