Nioxin Styling ThermActiv Heat Protector Spray helps protect normal and thinning hair against breakage and is designed to be used prior to styling to leave hair looking shiny and feeling healthy. Scientifically engineered Nioxin formula with LightPlex technology helps to protect hair against hair loss due to breakage. lightplex technology: A professional technology proven to work both inside and outside the hair. Conditioning agents absorb into the hair's cortex, retaining moisture for longer and protecting it from environmental damage, while flexible lightweight polymers wrap around each hair for balanced styles with no stiffness.