Redken's Acidic Bonding Concentrate Shampoo is sulfate-free for all types of damaged hair looking to strengthen hair, reinforce weakened bonds, and lessen breakage. Benefits Provides ultimate strength repair, intense conditioning and color fade protection Concentrated bonding care complex reinforces weakened bonds within your hair to improve hair strength and resiliency pH-balancing formula has an acidic pH to defend against the negative effects of hair coloring, styling tools, and even water, which has a pH of 7, to balance hair's pH back into a healthy range of 4.5-5.5 For all hair types and textures Fresh citrus and floral fragrance has top notes of orange, bergamot, marine, middle notes of freesia, peach and rose, and bottom notes of cedarwood, sandalwood and amber