From the book’s pattern description:



"The striped socks shown here are made with an angora-blend yarn and are so soft that they are perfect to wear while you cuddle up in a cozy armchair with a good book. The stripes on the heel, which is knit after the rest of the sock is completed, come together in an eye-catching bull’s eye-like pattern.  The "solid version" …. made from a yarn with different-color plies, is slightly more conservative. This pattern includes men’s and women’s sizing."