xtend Color Lock Keratin Replenishing Shampoo is a botanically blended gentle keratin infused cleanser. This sodium chloride-free shampoo is formulated to benefit all hair types especially hair that has completed a color service or a Simply Smooth color lock keratin treatment. xtend Color Lock Keratin Replenishing Shampoo will help to maintain the keratin levels within the Simply Smooth treatments and hair color service.