This is a pattern for multiple items. It can be used in virtually any yarn and any weight. To adjust sizing, make sure beginning chain is even count for mobius versions, and odd for non-mobius versions.
Adult size uses approximately 6 oz of Sport Weight yarn using the LONG Cowl option. Yardage is dependent upon the weight of the yarn you use -- Can use Fingering to DK weight -- and the size you are choosing to make.
This pattern set has instructions for a mobius cowl or long mobius scarf. The pattern has instructions for multiple weights of yarn from Worsted Weight to Chunky. You choose the yarn weight and hook that works best for you.