The heel flap and gusset form a traditional heel that is one of the most customizable and adaptable. If you have a high instep, this is a great heel for you. Ordinarily, you work the heel flap across an equal, even number of stitches and rows to form a square flap. If you have a high instep, however, you can add additional rows to create a fit that better contours to your foot shape.
Working the forethought heel, which you’ll sometimes see called the peasant heel, requires a strand of spare waste yarn, and is knit after the rest of the sock is finished. This tends to be a shallower heel, so it’s great for people with lower insteps. If, however, you have a higher instep and still like the look of this knit sock heel, you can make it a little roomier by adding a few rounds of knit stitches at the beginning of the heel before you start your decreases.
The no-wrap short-row heel is the quickest heel discussed here. You work this heel across half the stitches of your sock, and it tends to be a somewhat shallow heel. If you have a higher instep, you may notice a little pulling across the top when you wear the sock.