If your hair strands are thin or very straight, they may appear lacking in volume. To add volume to your hair, you should choose products specially produced for thin hair and avoid products that will weigh your hair down. Sulfate-free shampoo, specially developed by Yves Rocher for fine hair, gently cleanses fine hair. It strengthens the hair strands and provides volume without weighing the hair down. With its transparent gel texture, it helps increase hair volume after 3 uses. It helps deeply nourish the hair follicles with Organic Agave in its herbal content. * Organic Quinoa - provides volume without weighing down the hair. It gives visible fullness. *In Vitro Test Result Application: Apply to wet hair by massaging. Then rinse with warm water. Complete the routine with a volumizing conditioner for fine hair.