ghd Straight and Smooth Spray gives effortless straightening for thicker hair. With a high concentration of active ingredients, Straight & Smooth Spray for Thick/Coarse hair makes it easy to create a straight, sleek finish in thick or rebellious hair, while protecting from heat damage. Contains the ghd Heat Protection System. ghd Style Tip: Refresh your style in-between washes by spritzing over your dry hair before using your styler.