I REALLY recommend the Deborah Norville sock yarn, it contains bamboo which makes it SUPER soft! It does contain some wool (see www.premieryarns.com
). It's in my Ravelry page.
However, if that's not acceptable, I've made socks with 100% bamboo yarn called MeiMei Silk Bamboo (I found it on eBay) & their site is www.meimeicrafts.com
. I made the bamboo socks for a friend who is allergic to animal fibers. She loved them. Pattern is called Twinkleberry from Knitty: