Redken’s Acidic Color Gloss Shampoo is a revolutionary shampoo that extends color and provides salon-like shine. This sulfate-free shampoo provides long-lasting color vibrancy for up to 32 washes* and locks in intense molecular-level shine for up to 76% shinier hair**. The acidic pH formula with amino acids and vitamin E help seal the cuticle and lock in shine to protect color from fading and dulling that may be caused by water and heat. Use as a complete routine with Acidic Color Gloss Activated Glass Gloss Treatment, Conditioner and Heat Protection Leave-In Treatment.