AlfaParf S4U Twist'R Curl Amplifier For curly and wavy hair. Amplifies, defines, controls and separates curls with an outstanding anti-frizz effect. Has a long lasting action. Contains UV filter. Hold: maximum definition, medium control. Use: Dispense 1-2 doses and work evenly through the hair using a wide-toothed comb. Dry using a diffuser or leave to dry naturally using the fingers to help define curls.