The hat features a fair isle band just above the ribbing and a nifty twisted stitch pattern on the top, that forms a medallion when viewed from above.

You will need:
220 yds. color A (lt blue)
80 yds. color B (navy)
80 yds. color C (yellow)

Check over at String Theory for kits; I have not seen them up yet,but assume they are waiting for the final pattern to post them on the website.

SMALL uses size 2 (US) double point needles and 24 inch circular needles
LARGE uses size 3 (US) double point needles and 24 inch circular needles

You will also need:

cable needle
6 stitch markers
yarn needle

intermediate level pattern
skills needed: cabling & stranded colorwork
written & charted design