Nioxin Styling ThermActiv Thermal Protective Spray helps protect normal and weakened hair from breakage and is designed to be used before styling to leave hair looking shiny and feeling healthy. Nioxin's scientifically engineered formula with LightPlex technology helps protect hair against hair loss due to breakage. Lightplex technology: a professional technology that has proven itself both on the inside and outside of the hair. The conditioning agents absorb into the cortex of the hair, retain moisture for longer and protect it from environmental damage, while the lightweight and flexible polymers wrap each hair for balanced styles without stiffness. Spray evenly on towel-dried hair and style, Blow-dry hair and flat iron for heat-activated protection.