From the Knit Picks Website:
This sweater is a timeless classic inspired by a classic Swedish pattern. While the color work is very striking, it is an easy two color pattern to knit, perfect for all skill levels. The sweater is worked in the round with the sleeves knitted from the armhole down.

Needles:
Size 10 (6.0mm) and Size11 (8.00)mm) : 16” circular,
Size 10 (6.0mm) and Size11 (8.00)mm) : 24” Circular,
Size 10 (6.0mm) and Size11 (8.00)mm) : DPNs

Ed. note: Could also be worn by women. Use actual measurements to determine size.