The Solid Biological Shampoo is a vegan hair care product that is designed to revitalize your hair. It is infused with extracts of chestnut and birch, making it a natural and effective solution for anyone looking to improve the strength and radiance of their hair. The solid texture of the shampoo lathers up nicely and leaves your hair feeling refreshed and nourished. With its reinforcing and illuminating properties, this shampoo is a must-try for anyone seeking a high-quality hair care product.