Vichy Dercos Technique Energizing Dry Shampoo is a dry shampoo adapted to thinning or lack of density hair. Vichy Dercos Technique Energizing Dry Shampoo is easy to apply, leaves a fresh sensation on the scalp and leaves no visible residue. Vichy Dercos Technique Energizing Dry Shampoo is recommended for sensitive scalps and when an anti-sebum dry shampoo is needed between washes.