Why Cheap Knitwear Pills and Good Knitwear Does Not

This is less a set of instructions about pilling on knitwear than an argument, and it is worth saying so at the start.

What a pill actually is

Yarn is spun from fibres of finite length, and the ends of those fibres work their way to the surface under friction. Once free, they tangle with neighbouring loose ends and roll into the small dense balls we call pills.

The pill stays attached because a stronger fibre anchors it, which is why synthetic blends hold their pills longer than pure wool. This is a fibre length and construction problem rather than a cleanliness problem, and no detergent affects it. It is worst where friction is highest, which is why pills appear under the arms, along the sides and where a bag strap sits.

Why some garments resist it

Long-staple fibres have fewer ends per unit of yarn, so there is less to migrate to the surface in the first place. Tightly twisted yarn holds its fibres in place mechanically, while a loosely spun soft yarn releases them readily.

On a Sunday evening, densely knitted fabric has less surface movement between loops, which reduces the friction that starts the process. This is why very soft, loosely spun, inexpensive knitwear pills within weeks while a firm well-made knit does not. Softness at the point of purchase and durability are often in direct conflict, which is worth knowing before you buy.

Removing pills properly

A battery fabric shaver cuts pills off at the surface and is the fastest method for a whole garment. A knitwear comb or a fine-toothed comb works well on woollens and gives more control on delicate areas.

By the second month, never pick pills off by hand, since you are pulling a fibre that is still anchored into the fabric and enlarging the damage. Lay the garment flat on a hard surface and work in one direction with light pressure rather than scrubbing. Most garments pill heavily in the first few wears and then slow down, so one good de-pilling session often lasts a season.

Reducing it in the wash

Turn knitwear inside out before washing, which moves the abrasion to the face you do not see. Use a gentle programme with low agitation and a low spin, since mechanical action is the whole cause.

Wash knitwear with similar items rather than with jeans, towels or anything with hardware. Avoid the tumble dryer entirely for knitwear, as sustained tumbling is the most aggressive friction a garment ever receives.

A mesh laundry bag genuinely helps by preventing garments from rubbing directly against the drum and each other.

Buying knitwear that lasts

Check the fibre composition, and expect long-staple wool, merino and good cotton to outperform short-fibre blends. Feel the yarn rather than the surface, since a firmly twisted yarn feels springy while a soft one feels fluffy and compresses.

Look at the knit density by holding the fabric to the light, as a very open knit will move more and pill more. Check the seams and the finishing at cuffs and hem, which is where cheap construction shows first and fails first. Price correlates loosely with all of this and not reliably, so the physical checks are worth more than the label.

A routine you resent is a routine you will have abandoned by the third week.

Making knitwear last generally

Fold knitwear rather than hanging it, because hanging stretches the shoulders permanently under the garment's own weight. Air it between wears rather than washing it, since wool in particular recovers well overnight. Store clean in a sealed box or bag over summer, as moth larvae feed on protein fibres and are attracted to body soil.

Repair small holes promptly, since a dropped stitch in a knit runs and a two-minute darn prevents a two-hour one. Rotating between several knits rather than wearing one constantly gives each time to recover its shape between wears.

The takeaway

Buy the firmer yarn, wash it inside out on a gentle cycle, and take the pills off with a comb rather than your fingers.

Do the ten-minute version tonight rather than the proper version never.