Just noticed the new Lion Brand Baby Wool Yarn made out of "100% Total Easy Care Wool." A google search tells me it's treated wool, but treated with what? Anyone know?
It's probably chemically treated to make it superwash, which is machine washable.
One superwash yarn I love is Patternworks Bretton DK. It is 70% superwash wool, 25% nylon, 5% alpaca and very soft. I made a sweater from it and am now using some leftover for a lacy scarf.