The Paul Mitchell Neuro™ Prime Heat CTRL™ Blowout Primer prepares strands for blow-drying & delivers advanced thermal protection to help protect against heat damage. Achieve sleek, modern styles like never before with the Neuro® exclusive Heat CTRL® technology, which reduces the rate of heat transfer from roots to ends when using thermal styling tools. Prevents damage up to 86%.* * When using Neuro® Prime. Product was tested by an established, independent third-party laboratory.