The Russian Cast Off (Russian Bind Off) is a looser, stretchier, and more elegant way of casting off than the traditional method. It works particularly well as a finishing to ribbing, especially on a ribbed collar or a ribbed band (for example on a hat).
Knit back and forth on needles. Row knit all sts Row knit all sts Row knit to last 4 sts, K 2 tog, yo, K 2 sts in each of the last 2 sts new sts). Row bind off 2 sts (sl st to begin) and K across remaining sts on row.