Double soles, pretty cables, plus felted bulky wool equal toasty toes! Â These use about 100 meters of yarn for each slipper, and I prefer Reynolds Lopi. Â One skein will make one woman’s medium slipper. Â Cast on an additional 10 stitches and get an extra skein of wool for a much larger foot. Â Contrasting dark colors for the soles are recommended.