This is an infinity cowl that is made in the round. The basic stitches used are:

Chain
Slip Stitch
Single crochet
Double crochet

The pattern uses one skein of yarn, but can be easily adjusted to make a larger cowl, though making it longer would require another skein. This is a very simple pattern, easy to follow. The most challenging part is connecting the first row together.

You will need a sz H hook (or hook to obtain guage), and a yarn needle to weave in the tails.