Yarn question

[lgoddard]

Hi all. I am looking at a pattern for an "Irish Net Valance" and the yarn used was Naturally Caron Spa 75% microdenier acrylic 25% bamboo. My question is does anyone know what might be similar to this yarn that I might find at my LYS? What is different about "microdenier acrylic" and regular "acrylic." Would maybe the drape if the curtain be different if I use a different type of yarn?

Thanks for any suggestions,