Pilling is a surface defect of textiles caused by wear, and is considered unsightly. It happens when washing and wearing of fabrics causes loose fibres to begin to push out from the surface of the cloth, and, over time, abrasion causes the fibres to develop into small spherical bundles, anchored to the surface of the fabric by protruding fibres that haven't broken. The textile industry divides pilling into four stages: fuzz formation, entanglement, growth, and wear-off. Pilling normally happens on the parts of clothing that receive the most abrasion in day-to-day wear, such as the collar, cuffs, and around the thighs and rear on trousers.
Only synthetics pill.  The primary drivers of pilling are the physical characteristics of the textile (including both the initial fibre, and the way in which it is processed during manufacturing), the personal habits of the textile's wearer, and the environment in which the textile is used. Fibres such as wool, cotton, polyester, nylon and acrylic have a tendency to pill the most, but wool pilling diminishes over time as non-tenacious wool fibres work themselves free of the fabric and break away, whereas pilling of synthetic textiles is a more serious problem, because the stronger fibres hold onto the pills and don't allow pills to fall off.
In general longer fibres pill less than short ones because there are fewer ends of fibres, and because it is harder for the longer fibres to work themselves out of the cloth. Fabrics with a large number of loose fibres have a higher tendency to pill. Also, knitted fabrics tend to pill more than woven fabrics, because of the greater distance between yarn crossings in knitted fabrics than in woven ones. For the same reason, a tightly knitted object will pill less than a loosely knitted one. When a fabric is made of a blend of fibres where one fibre is significantly stronger than the other, pills tend to form as the weaker fibre wears and breaks, and the stronger fibre holds the pills onto the cloth.
Techniques used by the textile industry to avoid pilling include singeing the loose fibres protruding on the surface of textile, and spinning the yarn with a high number of twists per inch. Some fabrics are chemically treated during the manufacturing process in order to reduce their propensity to pill. Polymeric coatings are sometimes applied, to bind fibres into the fabric surface and prevent initial fuzz from forming. Polyester and cotton fibres are sometimes modified to be of lower-than-normal strength, which results in pills detaching easily from fabrics, once they are formed. Cellulase enzymes are sometimes used on cotton fabrics during wet processing, which removes loose fibres.
Textile authorities say consumers can prevent or postpone pilling of their fabrics by treating them with chemical soil release treatments that make the surface of the fabric more hydrophilic, and by turning clothes inside out before washing them. Washing in laundry detergent containing enzymes will get rid of pills on cotton clothing.
Pills do not interfere with the functionality of the textile, unless a spot with a lot of pills turns into a hole in the fabric. This is because both pills and holes are caused by the fabric wearing—a pill is fibre that was in the cloth. After the pill forms the fabric is thinner there, increasing the likelihood that a hole will form.
Pilling can seriously compromise a textile's acceptability for consumers, and is the focus of significant industry research. In the textile industry, severity of pilling is objectively evaluated using five parameters: pill number, the mean area of pilling; the total area of pilling; contrast, and density.
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