The Matrix Dark Envy Shampoo in a 33.8 fl.oz size is a product designed specifically for those with dark hair, especially brunettes or those with color-treated dark hair. This shampoo is formulated to enhance and maintain the richness and depth of dark hair colors. It helps to neutralize red undertones and prevent brassiness, keeping your dark hair looking vibrant and fresh. Additionally, it cleanses the hair gently without stripping away color or natural oils, leaving your hair feeling clean, soft, and nourished. If you're looking to preserve the intensity and richness of your dark hair color, the Matrix Dark Envy Shampoo could be a great addition to your hair care routine.