Arcus is a wide, horizontal, garter stitch variation cowl, with a slightly wind torn bottom edge.
Just like an arcus cloud formation

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Materials:
Approximately 130(330) yards of Northbound Knitting MCN Fingering
US size 6 (4 mm) circular needle (or size needed to obtain gauge)
Stitch marker
Tapestry needle

Gauge:
6 sts=1 inch in stockinette stitch

Finished Measurements:
Circumference=18(38) inches
Height=6.5 inches

Abbreviations Used:
K=Knit
P=Purl
St(s)=Stitch(es)
Pm=Place marker
Yo=Yarn over
K3tog=Knit three stitches together