ghd Natural Bristle size 4 BEST FOR... The size 4’s maxi barrel is best for blow-drying long and extra long hair, or creating lots of volume in mid-length styles. Natural bristles create a smoother finish. TO USE... Blast hair until it’s 80% dry. Working with medium sections, place the brush into the root area and direct the heat from your dryer at the barrel. Keep the tension as you move the brush through your hair, directing heat at the barrel as you go. STYLE TIP...Refresh hair that’s fallen flat between washes by spraying ghd Style Root Lift in the root area of dry hair. Lift sections up and away from the head with your size 4 brush and dry in with your hairdryer.