COLLECTION: Serie Expert / Intensive smoothing hair treatment with pro-keratin, kukui nut and evening primrose oil for frizzy, unruly hair. Gives suppleness as well as intensive shine. Evening primrose oil has a soothing effect on irritation-sensitive skin. The ultra-smoothing Série Expert Liss Unlimited hair mask from L'Oréal Professionnel effectively strengthens, smoothes and protects your hair fibres from moisture for up to 4 days*. The mask moisturises your hair, smoothes its surface and prevents additional and unwanted frizz. For long-lasting shine.