Frizz lets you add chaos to your hair (To be exact, an internal Noise filter is applied). With Frizz you can let your hair bend in any and all directions, even over the entire length of the hair.
Use the Frizz setting to define the strength of the frizz. The higher the value, the frizzier the hair will be.
Use this setting to vary the overall frizz of the hair.
Use these two settings to adjust the chaotic structure of the hair. The higher the value, the more often individual hairs will change direction. You can enter values far greater than 100%, if desired.
Use this slider to adjust the percentage of hair that should be affected by Frizz.
Curve lets you define precisely to what degree, along the length of the shaft of hair, Frizz should affect the hair.
A texture loaded here will use its grayscale values to define the amount of Frizz.
Since the Frizz and Kink channels (see below) are both especially important when working with long hair, a comparison of the two is illustrated in the image below: