How to Knit a Sock Heel — All Three Methods Compared

The heel is the part of sock knitting that stops most beginners in their tracks — and it's also where experienced knitters have the strongest opinions. There are three main heel constructions in common use, each with genuine advantages and real trade-offs. This guide walks through all three so you can choose the right one for your project, your yarn, and your foot.

Method 1: Heel Flap and Turn (The Classic)

This is the heel construction you'll find in most traditional sock patterns. It's been around for centuries, and it's still the most popular for good reason: it fits well, it's durable, and once you understand the mechanics, it makes complete sense.

The heel flap is knitted back and forth on half the sock stitches (the back half), building a rectangular reinforced panel. You then work a series of short rows to "turn" the heel — creating the cup shape that fits your actual heel — before picking up stitches along the sides of the flap to rejoin the round and work the gusset that tapers back to the foot width.

How it works, step by step:

Divide your stitches in half. The back half becomes your heel flap stitches; the front half rests on a holder or separate needle.

Knit the flap back and forth, typically in a slip-stitch pattern (slip 1, knit 1 across right-side rows) for 2.5–3cm or until it's roughly square. The slipped stitches create a chain edge and a denser, more durable fabric.

Turn the heel: work short rows using decreases to shape the cup. A typical turn: knit across to the centre, then knit a few more stitches past centre, ssk, k1, turn; purl back a few stitches past centre, p2tog, p1, turn. Continue until all stitches are worked.

Pick up stitches along both sides of the heel flap. Rejoin to work in the round with all stitches.

Work gusset decreases every other round until you're back to your original stitch count, then continue the foot.

Best for: People who want the most durable, best-fitting heel. The heel flap area is reinforced, and the gusset gives extra room for a high-volume heel and arch. If you have a wide heel or high instep, this construction accommodates you better than the others.

Watch out for: Gaps at the gusset pick-up points. When you pick up stitches, pick up one extra stitch in the corner on each side, then decrease it away on the first round — this closes the gap neatly.

Method 2: German Short-Row Heel

The short-row heel (also called the flap-less heel or simply "short-row heel") builds the heel cup using only short rows — no flap, no gusset, no picking up stitches. The result is a smoother-looking heel with no seam lines or gusset shaping on the instep.

German short rows (GSR) are the most popular short-row method for socks because they close easily and don't leave holes. The key technique is the "double stitch": when you turn, you bring the yarn to the front, slip the last stitch, then take the yarn back over the needle, pulling the stitch up so both legs sit on the needle. This double stitch closes the gap that would otherwise form at every turn.

How it works:

Again, work across the back half of your sock stitches only.

Knit across, then turn and work a double stitch (DS) on the first stitch after the turn. Purl back to one stitch before the end, turn, DS.

Continue: each row, work to just before the previous double stitch, turn, DS. You're shortening the active row each time.

Then work back out: knit to the first DS, knit the double stitch as one (both legs together), continue to the next DS, knit it together. Work until all double stitches have been resolved.

Rejoin to work in the round. No pick-up stitches required.

Best for: Knitters who want a simpler construction with fewer steps. The German short-row heel is particularly good for narrow heels and works well in colourwork socks where you want a clean, uninterrupted pattern. It's also easier to keep track of where you are.

Watch out for: Fit for wide or high-volume heels. Without a gusset, there's no extra fabric to accommodate a prominent heel. If you have a wide foot and narrow ankle this can feel tight across the instep.

Method 3: Afterthought Heel (Peasant Heel)

The afterthought heel is knitted last — after you've completed the leg and foot. While knitting the foot, you knit across the heel position with waste yarn, then continue to the toe. Once the sock is finished, you remove the waste yarn, put the live stitches on needles, and knit a heel in the round as a kind of tube that you then close at the bottom.

How it works:

When you reach the heel position (roughly 2cm after the leg ends, though placement varies by pattern), knit the next round's worth of heel stitches with smooth waste yarn in a contrasting colour. Slip them back to the left needle and knit them again in your working yarn. Continue the foot.

Knit the toe and finish the sock.

Now remove the waste yarn carefully, placing the live stitches from above and below the waste yarn onto your needles. You'll have stitches on top and bottom — typically one fewer on one side due to how the yarn lies.

Pick up one stitch at each corner to avoid holes, giving you a round of stitches that forms a tube.

Knit in the round, decreasing at the four corner points every other round until you have about 8 stitches remaining. Graft closed with Kitchener stitch.

Best for: Colourwork socks where you don't want to break up the pattern for heel shaping. Because the leg and foot are knitted straight through, you can run your pattern continuously from cuff to toe and add the heel (usually in a plain or coordinating colour) afterwards. Also useful if you want to easily replace the heel later when it wears out.

Watch out for: The fit is round and somewhat baggy compared to the other methods. Afterthought heels work best on feet with a moderate heel depth and benefit from a heel worked in reinforcing yarn for durability.

How to Choose the Right Heel for Your Sock

Here's a quick guide to picking the right construction:

Durability is your priority: Heel flap and turn. The reinforced flap and extra gusset fabric make this the longest-wearing option.

Simplicity is your priority: German short-row heel. Fewer steps, no pick-up stitches, and very easy to replicate consistently.

You're knitting colourwork or stripes: Afterthought heel. Keeps your pattern uninterrupted and lets you choose the heel colour freely.

Wide heel or high instep: Heel flap with a larger-than-standard gusset (pick up extra stitches, do more decrease rounds).

Narrow heel or neutral instep: Any of the three work well. Short-row heel fits neatly on narrow heels.

Toe-up knitting: German short-row heel adapts seamlessly to toe-up. Heel flap can be worked toe-up (called a flap-and-gusset heel worked in reverse). Afterthought works identically in either direction.

Gauge and Yarn Considerations

All three heels work in any sock-weight yarn, but reinforcing yarn is worth considering for heel flap and afterthought constructions. Reinforcing thread (a thin nylon or wool-nylon filament) is held alongside your sock yarn through the heel section to add durability without changing the gauge significantly.

Not sure which heel is right for your project? Ask Emma for a personalised recommendation →