Hi there! I've knit socks with dk yarn, and if you don't mind acrylic many would do. I found some fine wool, but not too fine, at Wal Mart, and it's called Georgia Yarn. I haven't knit with it yet, but it feel beautifully soft. It would work up in a dk pattern. For acrylic, I've used James Brett's Marble, and it seems to be wearing well. I don't dry it in the dryer, though. I like to knit dk weight socks for winter. They do knit up faster, too.