PRO THICK Technology is a complex of thickening polymers that form bonds between strands for space. The space created gives a thicker appearance on the hair and makes achieving your desired style easier. Nioxin Pro-Thick Thickening Gel provides shapes and texture for a thicker-looking effect*. The strong hold gel leaves hair shiny and without any heavy build-up. *vs. untreated How to use: Apply a small amount of product into the palm of your hands, and then work through towel-dried hair. Blow dry and style as usual.