"Self-patterning fun!"
We love knitting socks from the toe upit lets you use every last inch of yarn! And knitting the heels in afterwards allows you to use self-striping yarns (like the famous Arne & Carlos colorways shown here) without breaking up the pattern. Plus the heels and toes are easy to replace when they wear out which will take quite a while, given the rugged durability of Regia 4-ply.
Be sure to see the "Knitter's Notes" for a helpful perspective.