From Hip To Knit:

Maybe this should be called the lightning speed top - it’s that fast. In addition to the speed in using the super chunky yarn or knitting multiple strands of lightweight yarn together, this top is further simplified by having the edge finishing built right in to the knitting. Once the knitting is completed, all that’s needed is some simple seaming.

More Yarn Info: Single-strand version uses Super chunky-weight yarn, or the Multi-strand version (using 3 differently colored skeins) uses Worsted-weight yarn.