Lana Grossa's "Meilenweit Bega Boots Stretch 100" is a plied fingering yarn designed for socks. It is 70% wool, 23% nylon, and 7% elastic and is machine washable. The elastic gives the yarn a stretchiness that keeps the socks where you want them.
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Lana Grossa - Meilenweit Mega Boots Stretch Softcolor 100 - Spring 2008