Futatabi6.5 Ai Indigo Sorahikohime Zyu45R's commitment to denim goes beyond our original indigoit lies in the texture of the fabric itself. Through trial and error, using vintage denim as a guide, we created this 5 pocket denim woven roughly from extra thick 6. 5 count yarn, with an uneven, rugged surface. The indigo comes from Awa Ai, the natural indigo of Tokushima. It takes over a year to create the dye from plant leaves. Over time, the color transforms into a muted, translucent tone.