This is a stretchy 3x1 basic rib sock, knitted from the top down. Sizes are easily altered by increasing or decreasing by 4 sts (one 3x1 rib repeat). The heel flap is created in a slip-stitch pattern which reinforces and increases durability. Less than one ball of the Schoppel-wolle Crazy Zauberball is used, so you could make the leg longer to fit a taller boot.