It is a paraben free shampoo that covers hair in a nourishing shield to provide frizz control and smoothness. Smoothproof shampoo gives perfectly smooth, frizz-free hair for up to 72 hours*. To use, apply to wet hair with a gentle massaging motion. Lather well. Rinse the hair, for best results follow up with a SMOOTHPROOF conditioner. Biolage SMOOTHPROOF Conditioner detangles and reduces frizz, defends against humidity to keep hair manageably smooth.