Description from Knitty.com:

You have enough boxy, oversized, bumming-around-the-house sweaters. We know you do.  Vibrant colors, extradeep ribbing, and a big bold collar make Cathode an excellent way to jolt yourself out of the winter blues. Add buttons or a cute pin at the neckline to wear the turtle closed for extra snuggles.

Cathode is knit in the round, from the top down, in one piece.