A smart hot brush for quick and effortless, 3D volume that creates body from root to tip. Preset to the optimum styling temperature of 365°F.The 1.25" barrel features smooth 0.5cm nylon bristles for maximum root lift creating instant volume and body from root to tip. ghd's ultra-zone technology monitors heat 250x a second to maintain the healthiest temperature without extreme heat for healthier-looking, long-lasting voluminous results.