Polyester-cotton blends pill the most of any common fabric, followed closely by pure short-staple cotton, cashmere, and loosely knit wool. The root cause is always the same: short or weak fibers work their way to the surface through friction, then tangle into tiny balls instead of falling away cleanly. But the specific fiber, how it’s spun, and how the fabric is constructed all determine how fast and how badly pilling shows up.
Why Blended Fabrics Top the List
Polyester-cotton blends are considered one of the worst offenders in the textile industry. The problem comes down to how the two fibers interact. Cotton fibers are short and break free from the yarn easily, migrating to the surface where they start to bunch up. In a 100% cotton fabric, those tiny fiber balls eventually break off and fall away on their own. But in a blend, the polyester fibers are strong enough to anchor the pills in place, so they accumulate and never shed. That’s why a 50/50 cotton-poly t-shirt can look far worse after a few months than a pure cotton one.
Textile researchers describe pilling as one of the most serious aesthetic defects in polyester-cotton knitted fabrics, noting it directly shortens the garment’s useful life. If you’ve ever wondered why a cheap blend hoodie looks worn out after a season while a decent cotton tee still holds up, this is why.
Fabrics Ranked by Pilling Risk
The textile industry grades pilling resistance on a 1-to-5 scale, where 1 means very severe pilling and 5 means none at all. While individual garments vary based on quality, here’s how common fabrics generally rank from worst to best:
- Polyester-cotton blends: The combination of weak cotton fibers and strong polyester anchors creates persistent, visible pills. Loosely knit blends are especially bad.
- Cashmere: Extremely fine and soft, but delicate. Cashmere is more prone to pilling and damage than almost any other animal fiber.
- Short-staple cotton: Budget cotton fabrics use fibers under about 1 inch long, which migrate to the surface quickly. This is the cotton in most basic t-shirts and bedsheets.
- Wool (standard): Susceptible to pilling wherever friction occurs, particularly at the underarms, sides of the torso, and inner sleeves.
- Polyester (100%): Pills when subjected to repeated rubbing, though pure polyester pills less aggressively than polyester blends because there are no weak cotton fibers to feed the process.
- Merino wool: Noticeably more durable than standard wool or cashmere. Its use in performance and athletic wear reflects its better resistance to pilling and general wear.
- Long-staple and extra-long-staple cotton: These premium cottons (like Egyptian or Supima) produce smoother yarn with fewer loose fiber ends, making them significantly more resistant to pilling.
- Tightly woven silk and linen: Silk is a continuous filament fiber with no short ends to migrate, and linen’s rigid structure resists tangling. Both rarely pill under normal use.
Fiber Length Is the Biggest Factor
The single most important predictor of pilling is how long the individual fibers are. Short-staple cotton fibers tend to pill and lose their shape over time far more than long or extra-long-staple cotton. Longer fibers create smoother, stronger yarn because there are fewer exposed fiber ends poking out from the surface. Extra-long-staple cotton offers the highest breathability, softness, and pilling resistance of any cotton type.
This is why thread count alone doesn’t tell you much about bedsheet quality. A 400-thread-count sheet made from short-staple cotton will pill faster than a 300-thread-count sheet made from long-staple Egyptian cotton. The fiber length matters more than how tightly the threads are packed together.
Loose Knitting Makes Everything Worse
Even a decent fiber will pill if the fabric is knitted loosely. In a dense, tightly knit fabric, the fiber ends that poke out from the surface are too short to grab onto each other. They can’t tangle, so pills never form. In a loosely knit fabric, longer fiber ends stick out and have room to migrate, twist together, and ball up. This is why cheap knitwear often starts pilling within weeks of purchase. Manufacturers save money by using less yarn per square inch, but the tradeoff is a garment that looks old fast.
Woven fabrics generally pill less than knits for the same reason. The tight interlocking structure of a woven shirt or pair of trousers holds fibers in place better than the looped structure of a knit sweater or jersey.
How to Remove Pills Without Damaging Fabric
Two tools dominate pill removal: electric fabric shavers and sweater stones (a type of pumice). They work differently and suit different situations.
Electric fabric shavers are the go-to for most people. They’re fast and work well on flat, stable fabrics like cotton t-shirts or polyester fleece. But they can struggle with heavy pilling on textured fabrics like wool coats, where the blades don’t get close enough to the surface to grab everything.
Sweater stones tend to work better on knits and heavier fabrics. Users consistently describe them as not just removing pills but reviving the fabric’s overall texture. They also pick up pet hair. The downside is that they’re slower and more labor-intensive. You should always test a sweater stone on a hidden area first, since the abrasive surface can potentially snag delicate knits. For stubborn pills that neither tool handles, some people carefully use a disposable razor, though this carries a higher risk of cutting the fabric.
Preventing Pills Before They Start
Your laundry routine has a direct effect on pilling. Washing clothes inside out reduces surface friction in the machine. Using a gentle or delicate cycle matters more than water temperature, since the agitation is what loosens fibers. Overloading the washer forces garments to rub against each other more aggressively.
Detergents containing cellulase enzymes can modestly reduce pilling on cotton and cotton-blend fabrics over multiple washes. These enzymes break down the tiny fiber ends before they have a chance to tangle. They won’t eliminate pilling on a fabric that’s prone to it, but they slow the process. Check your detergent’s label for “cellulase” in the enzyme list, or look for detergents marketed for keeping clothes looking newer.
On the manufacturing side, some garments are treated before they ever reach you. Singeing (briefly passing fabric over a flame to burn off loose fiber ends) and heat setting are industrial processes that reduce pilling in polyester-cotton blends. You can’t replicate these at home, but they’re worth knowing about because they explain why two garments made from the same blend can behave very differently. A well-finished garment from a quality manufacturer will pill less than a cheap one made from identical fiber, simply because of how it was processed.
What to Look for When Shopping
If pilling drives you crazy, your best moves happen at the point of purchase. Look for long-staple or extra-long-staple cotton in shirts and bedding. Choose merino over standard wool or cashmere if durability matters more than softness. Avoid polyester-cotton blends when possible, or at least choose ones from brands known for better finishing. Feel the knit density before you buy: if you can see light through a sweater when you hold it up, it’s loosely knit and will pill quickly.
For synthetics, tightly woven nylon and high-denier polyester resist pilling better than the soft, brushed polyester used in fleece and loungewear. Silk and linen are naturally resistant and rarely pill under normal conditions. When in doubt, a tighter weave in any fiber will outperform a looser one.