The wool comes from a breed of sheep called Columbia. It's naturally resistant to felting (not to say that it *can't* happen), so these socks can be machine washed on cold gentle and laid flat to dry.
I worked up a sock out of the light grey 100% Wool and it's gorgeous. It will soften up with each washing and wear like a brick.
I hope to have additional colors of the 100% in a short little time, they were back ordered.
I was able to get a Men's 10 with a long 10" height out of one skein (it was close).
I have all five colors of the 75% Cotton 25% Wool, which should be great for warmer weather. I was only able to get a swatch done so far -- but even though I normally dislike cotton sock yarns this felt great.
Both the cotton blend and the all wool come in 193 yard pull skeins for $7.00. They're all ready to knit with no winding, and the price is great.
I would suggest these yarns for either basic ribbed socks (like shown), or something where you're trying to put in stitch detail. Often the beautiful hand painted yarns are so busy that they hide all that work. The subtle heather in these two yarns will provide a perfect base to accentuate the stitch work.