How to Darn Hiking Socks: A 5-Minute Fix for Holes

A hole in a hiking sock is not the end of the sock. It is a ten-minute job with a needle and thread, and getting good at it is one of the highest-value repair skills you can learn, socks take more punishment than any other piece of kit and fail more often than anything else you own.

What you need

• A darning needle: blunt-tipped and large-eyed, so it does not split the yarn
• Matching thread: wool or a strong polyester thread in a similar colour
• Something to stretch the hole flat: a darning mushroom, a lightbulb, or an egg held inside the sock
• Scissors

A darning mushroom is cheap and lasts forever, but a lightbulb wrapped in a scrap of cloth does exactly the same job.

Before you start: catch holes early

Darning works best when the fabric is merely thin, not when it has opened into a wide hole. Check heels and toes after every few walks. A spot that feels noticeably thinner is the moment to darn, the patch stays small and the sock keeps its shape.

The weave darning stitch, step by step

1. Stretch the sock over the mushroom so the damaged area sits flat and taut. The fabric must be held under tension or the darn will pucker.
2. Anchor the thread in healthy fabric about a centimetre beyond the edge of the damage, not at the hole itself.
3. Run the warp: sew straight parallel lines across the hole, spacing them about a millimetre apart, catching solid fabric on both sides. This is the set of threads your patch will be built on.
4. Run the weft: turn and weave back across the warp, over one thread, under the next, pulling gently through.
5. Keep going until you have covered the hole and a few millimetres of the surrounding fabric on every side.
6. Anchor and trim the thread into healthy fabric on the far side.

The motion is weaving, not sewing. You are building new cloth across the gap rather than pulling the edges together, pulling the edges tight just makes a hard lump that fails again immediately.

Getting it right

• Keep tension light. If the darn pulls the sock into a cone, it is too tight.
• Work over a slightly larger area than the hole. Thin fabric beside the hole will be next.
• Widen the weave gradually rather than starting a second separate patch.
• Finish on the outside of the sock so the knot sits where you will not feel it.

When to stop repairing

If the yarn around the heel is simply disintegrating rather than wearing through, or the elastic has gone and the sock will not stay up, the sock is done. Wool that has become thin and brittle across a whole heel cannot be darned into service.

Why bother

Households throw away a large number of pairs of socks every year, and most of them were repairable. Multiply one small habit across a walking wardrobe and you are keeping dozens of pairs out of the bin for an evening's worth of sewing. The gear you already own is the greenest gear you have.

Related reading

• The same decision for boots: resole or replace
• Reproofing a jacket, the other cheap fix

Darning a thin spot before it opens

The same stitch, applied earlier, prevents a hole rather than filling one. When a heel feels noticeably thinner but is not yet open:

1. Stretch the sock over your darning egg or mushroom.
2. Weave the warp and weft across the whole thin area, extending a centimetre into firm fabric on every side.
3. Keep the weave slightly looser than you would for a hole, you are adding cloth, not closing a gap.
4. Weave in the ends rather than tying bulky knots, so the repair sits flat inside a boot.

A prevented hole takes three minutes. A hole that has opened and spread takes ten, and if the surrounding fabric has gone brittle the sock may be beyond saving.

Keeping socks alive for longer

• Wash cool and air dry. Hot washes and tumble dryers destroy the elastic and harden wool.
• Turn inside out before washing, the outer face takes the abrasion, and detergent reaches the skin side better.
• Never tumble dry merino hot; it felt and shrinks.
• Rotate pairs rather than wearing the same favourite pair every day. Elastic needs a rest to recover.
• Check after each multi-day trip, which is when heel wear shows up fastest.

Which thread to use

Wool yarn blends into a wool sock and moves with it; a strong polyester thread is far tougher but shows visually and can create a slightly stiffer patch. For high-wear heels, a fine polyester thread in a matching colour gives the longest life. What matters most is that the thread is strong enough not to snap while you are tensioning the weave, and that the needle is blunt so it does not split the sock yarn.

When the whole sock is done

Once the elastic has gone, the sock will not stay up regardless of repair, or the heel has become thin across its whole area with brittle yarn, the honest answer is to retire it. Cut it up for rag use rather than binning it; worn merino makes excellent cleaning cloth, which is one last piece of reuse before it leaves the house.