The diffuser (also called air shower or soft styler) is a large round attachment that creates an indirect airflow - similar to air drying. This technique is ideal for gently drying natural curls or permed hair to beautifully texture the curls. With some Valera hair dryers, a diffuser is already included, for all other models you can buy the matching diffuser separately. Professional accessories from Valera, Swiss hair specialists since 1955