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A heat-activated leave-in thickening treatment, Ghd Rehab Fine Hair Thickener spray features an advanced, lightweight formula for a strand thickening effect 1 Increases the diameter of each strand, delivering instantly thicker and fuller hair 2.An instant thickening effect for visibly fuller hair. Activated by heat and designed to work best with the Ghd Duet Blowdry, or any Ghd Helios Hair Dryer and Ghd Hair Straightener, this treatment is perfect for fine or thin hair types. It plumps each strand while helping to maintain the hairs natural condition, leaving it looking and healthier-feeling with added body and bounce.