If you want to make this cowl / infinity scarf you will be able to do so with all different types of yarn. Chunky to DK (i wouldn't suggest lace weight as this may not keep you warm enough in the winter) and Acrylic to the best Merino or Alpaca out there.
I would say that the crochet cowl pattern can be taken on by someone that knows the basics of crochet, it is repeatative and easy to pick up.
|Teal / Sea Green - Merino + Kid Mohair mix|
|Beige Stripy - Acrylic|
|Pattern Available @ Craftsy|