Short answer: pills form where fabric rubs against something repeatedly, so they appear under the arms, along the sides, where a bag strap sits and across the seat of trousers. Short fibres work loose, tangle into a ball and stay attached by a longer fibre underneath. Wash inside out, cold, on a gentle cycle with a full drum of similar fabrics, skip the dryer, and shave the pills off with a fabric shaver rather than picking them. Pilling is a friction problem, not a sign the garment was cheap.
Which fabrics pill, and why
| Fibre | Pills? | Why |
|---|---|---|
| Merino and lambswool | Yes, early then stops | Short fibres work loose at first; once they have gone, the surface settles |
| Cashmere | Yes, especially cheaper grades | Very short, very fine fibres. Longer-staple cashmere pills far less |
| Cotton | Mildly | Pills form but break off on their own, because cotton is not strong enough to hold them |
| Polyester and acrylic | Yes, and permanently | The fibre is strong, so pills form and never let go. This is the worst case |
| Poly-cotton blends | Yes, visibly | Cotton sheds, polyester holds on. The pills end up anchored by the synthetic |
| Linen | Rarely | Long, smooth fibres with little to work loose |
| Silk | No | Continuous filament; there are no short ends |
| Nylon and elastane blends | Yes | Strong fibres plus high friction areas, which is why activewear bobbles |
The counter-intuitive part is that a strong fibre pills worse than a weak one. On cotton the pill snaps off and disappears; on polyester it stays, which is why a cheap fleece looks tired after a season and a cotton jumper does not.
Where it happens, and what that tells you
- Under the arms and along the sides: arm against body. Unavoidable, but slowed by washing inside out.
- Across the shoulders and upper back: a backpack or shoulder bag. Switch shoulders, or accept it.
- Across the seat and inner thighs: sitting and walking. Worst on polyester trousers and school uniform.
- Cuffs and sleeve fronts: desks, tables and sleeves pushed up.
- All over, evenly: the wash, not the wear. Too vigorous a cycle or a load mixed with towels and denim.
- Only after tumble drying: the dryer. Heat and tumbling together are the fastest way to bobble knitwear.
How to remove pills
| Tool | Best for | Watch out for |
|---|---|---|
| Battery fabric shaver | Everything, and the fastest by far | Keep the garment flat and taut; never shave it on your body |
| Sweater comb | Cashmere and fine knits | Short strokes in one direction. Gentler than a shaver |
| Sweater stone or pumice | Chunky knits and coats | Aggressive. Test on a hem first |
| Disposable razor | Emergencies only | Very easy to cut through the fabric. Lay flat, barely touch, short strokes |
| Velcro or packing tape | Loose pills and lint, not attached ones | Will not remove anything properly anchored |
| Picking by hand | Nothing | Pulls the anchoring fibre out and makes a thin patch or a hole |
Lay the garment flat on a hard surface, smooth the area taut with one hand, and work in short passes in a single direction. Go slowly across ribbing and seams, where the fabric lifts and a shaver can catch. Shaving removes the pills but also removes a little fabric, so it is a treatment to use when it is needed, not monthly.
How to slow it down
- Turn everything inside out. The friction then happens on the side nobody sees. This is the single most effective change.
- Wash with like fabrics. Never knitwear with denim, towels or anything with zips and Velcro. Those are what abrade the surface.
- Cold, gentle cycle, lower spin. The delicate or wool programme exists for this. See cycles and settings explained.
- Do not pack the drum. Clothes crushed together rub against each other for the whole cycle.
- Use a mesh bag for fine knitwear and activewear.
- Skip the dryer entirely on anything that pills. Dry flat. The guide is in how to dry clothes properly.
- Skip fabric softener. It coats the fibre and, on synthetics, makes loose ends easier to tangle.
- Rest knitwear between wears. Fibres recover given a day, and a recovered fibre resists abrasion better.
- Wash less often. Every cycle is friction. Airing a jumper does more than washing it, as covered in washing less.
Buying to avoid it
- Tightly spun, tightly knitted fabric pills less than loose, fluffy or brushed fabric. Hold it up to the light: if you can see through the knit easily, it will bobble.
- Long-staple fibres pill less. On cashmere this is most of the price difference between a jumper that lasts and one that does not.
- Single-fibre garments pill less than blends, because blends pair a shedding fibre with one that holds on.
- Rub the fabric briskly between your palms for ten seconds in the shop. If pills appear, they will appear in week two.
- A little pilling on new merino is normal and stops after the first few wears. Permanent pilling on polyester is not a phase.
Common problems
| Problem | Cause | Fix |
|---|---|---|
| New jumper pilled within a week | Short loose fibres from manufacturing working out | Shave once; it usually settles. Wash inside out from now on |
| Pills only on one shoulder | A bag strap | Switch shoulders, or use a backpack with wider straps |
| Thin patch after de-pilling | Picked by hand, or the shaver pressed too hard | Not reversible. Shave flat and light next time |
| A small hole where a pill was | The anchoring fibre was pulled out | Darn it before it runs. Never pull a pill off |
| Activewear bobbled all over | Washed with towels, or tumble dried hot | Mesh bag, cold, air dry. Synthetic pills never let go |
| School trousers shiny and bobbled at the seat | Polyester abrasion from sitting | Shave the pills; the shine is permanent. Wash cooler and inside out |
| Pilling with matted, dense fabric | Wool has felted as well as pilled | A different problem. See why clothes shrink |
Frequently asked questions
What causes clothes to pill?
Friction. Short fibres work loose from the surface, tangle into a small ball and stay attached by a longer fibre underneath. It happens where fabric rubs repeatedly, which is why pills appear under the arms, where a bag strap sits and across the seat of trousers, rather than evenly all over.
Does pilling mean the fabric is poor quality?
Not necessarily. A strong fibre such as polyester actually pills worse than cotton, because the pill never breaks off. Loose, fluffy or brushed knits pill more than tightly spun ones, and short-staple cashmere pills more than long-staple, so it is more about construction and fibre length than price.
How do you remove pills from clothes?
A battery fabric shaver is fastest and safest. Lay the garment flat, pull the area taut and work in short passes in one direction. A sweater comb is gentler for cashmere. Never pick pills off by hand, because that pulls out the anchoring fibre and leaves a thin patch or a hole.
How do you stop clothes from pilling?
Wash inside out, cold, on a gentle cycle with similar fabrics only, never with denim or towels. Do not pack the drum, use a mesh bag for fine knits, skip fabric softener and keep anything that pills out of the dryer. Washing less often helps too, since every cycle is friction.
Does the dryer make pilling worse?
Yes, significantly. Heat and tumbling together are the fastest way to bobble knitwear and activewear. If a garment started pilling only after you began tumble drying it, that is the cause. Dry flat or hang instead.
Can you fix clothes that have already pilled?
You can remove the pills, which restores the look, but shaving also takes away a little fabric, so it is not something to do every month. The underlying thinning and any shine from abrasion are permanent.
Why does my cashmere pill but my friend's does not?
Fibre length. Long-staple cashmere has fewer short ends to work loose, and it costs more for exactly that reason. Cheaper cashmere pills early and keeps pilling. Washing inside out, cold and drying flat slows either one down considerably.
