Ski hat is knit using an old Swedish technique called tvåändsstickning or tvebandsstrikking in Norwegian -- or "two-end knitting".  This method will keep the hat more wind resistant and surprisingly soft.

Sizes: XS (Baby), S (Child), M (Adolescent), L (Adult)
Yarn: 90 (100, 118, 128) yds worsted yarn and 5 yds contrasting color for edging and tassel
Needles: US 9 circular (12-16") and US 9 dpns
Gauge: 4.75 sts = 1" in St st