The yarn is Araucania Ruca, a dk-weight yarn made of 100% sugarcane fiber, and it's a particularly good match for the pattern. Plant fibers like sugarcane, bamboo, and cotton all lack elasticity, giving them a tendency to stretch out of shape. For some projects, that would be a disadvantage to account for by changing needle size or even adding an elastic thread, but for a drop stitch scarf, it's a perfect fit. The elongated stitches of the seafoam stitch pattern drape beautifully in a plant fiber.
Amy's scarf has gotten a lot of knitters interested in the Ruca yarn, so we ordered a few new colors to give aspiring drop stitch scarf makers more options. We were disappointed to discover that Araucania no longer produces the same colorway that Amy used, but we got two similar colorways for those that want the same look.
Take a look at the Ruca when you're seeking a smooth, shiny plant fiber, and if you'd like to make a drop stitch scarf of your own, you can download the pattern for free on Ravelry. See you at the shop!