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 Spray adds texture and long-lasting body for thicker-looking hair*. *vs. untreated. How to use: Shake well before use. Spray on clean damp hair from the roots to the ends. Comb through and then blow dry for volume and style as desired. Leave a Review after purchase and recieve £25 off your next purchase. Terms Apply*