The Lisse design rehydrating mask helps to prevent dryness and keep hair feeling moisturised and healthy. Your hair will be left looking shiny and bright and will be easier to manage. Say goodbye to unruly hair. The mask is great for those who have had the keratin treatment, to use as an in-between booster top up. This will help to prolong your treatment. However, it can be used on hair that has not had a keratin treatment as a hydrating smoothing mask. Directions: Apply to damp clean hair. Leave for 5 minutes then rinse.