This is an infinity cowl using one 100g hank of a variegated worsted weight yarn and approx 80yds each of 3 solid or tonal complementary colors.
The stitchpattern is a simple 4-stitch, staggered 2 x 2 rib repeat called Herringbone found on page 131 of Vicki Twigg’s ‘Twigg Stitch’ book.
The crochet hook is only required if using the recommended ‘Imitation I-cord cast-on’.
The design can be easily modified by yarn type, fewer contrast colors, or length