Transform lack-lustre locks with the Extreme Length Primer Treatment Duo from Redken. Specially formulated with the brand's unique Interlock Protein Network to effectively prevent split ends and reduce breakage and biotin to strengthen hair from root to tip and deeply condition locks. The rinse-off treatment targets distressed hair and promotes growth to help you achieve healthy-looking, voluminous locks. The handy pump bottle makes application easier and reduces spillage.