Schoppel Wolle Zauberball is a wonderful self-striping yarn with long color repeats that fade into each other. You'll love the (machine-washable!) finished socks you get when knitting with Schoppel Wolle Zauberball. One ball will make a pair of socks with most patterns, but you'll want to be sure to check your pattern requirements to be sure you have enough yarn.
Note: You will need approximately 400 yards for a basic pair of socks for an average women's size.