Used by professionals. The science of moisture for healthy hold. Professional alcohol-free styling mousse for luxurious volume, body and healthy hold. Hydrology System: Shampoos, conditioners, and styling products that infuse hair with Hydratein Moisturizing Protein Complex. Locks in the moisture you need. Locks out the moisture you don't. This product contains a maximum of 16% VOC. This product has not been tested on animals.