From website:

NL5 - HATS THAT FIT

Create nine different hat styles with this circular knit pattern. Choose a rolled, turned under or ribbed cuff and finish with the choice of a pointed, square or round top. Using the formula and your favorite yarn, make a hat that fits.

SIZE: To fit any head size

YARN: Any weight of your choice

NEEDLES: Circular in size recommended for yarn weight

See also NL23 More Hats That Fit