Kerastase Nutritive Masque Magistral 500 ml/16.9 oz BACK BARTreat your hair to the Krastase Nutritive Masque Magistral, a restorative hair mask that works to nourish and soften severely dried out, thick hair. Utilising 4600 PPM Irisome Complex and Benjoin Resin technologies, the intensely nourishing formula gets to work on wanting hair; its balancing and protective properties help to smooth and soften every strand, improve manageability and detangling, and inspire mirror like shine.