Worsted version requires a knitting board that will knit worsted weight yarn with 16-24 needles on each side. The Authentic Knitting Board and the Noble Knitter can be adjusted to do this. Bulky version requires a board with 12-18 needles on each side. The Authentic Knitting Board with 1/2” spacing or a Knifty Knitter long loom may be used for the bulky version.2 colors of yarn are needed for each pair. Suggested yarns: Loops and Threads Impeccable worsted weight, or Kuka merino bulky weight.Bulky gauge is 3 stitches/3.3 rows/inch.It is best to have 2 skeins of each color of yarn on hand. Sizes: ladies 5-6, 7-8, 9-10men 7-8, 11-12men 9-10, men 11-12, 13-14