Trekking Pro Natura - Ashes #1610. What do you get when you combine German craftsmanship, the highest quality wool & real bamboo fibers? Zitron's "Trekking Pro Natura" yarn, of course! So you get the benefits of a fine wool plus the soft feel & added strength of the bamboo. We bet you'll enjoy knitting with this lovely so much you'll want to use it for more than just socks -- "Trekking Pro Natura" is perfect for any fingering-weight knitting or crochet project you have in mind. Made of 75% wool & 25% bamboo.