Football Jersey Knowledge
Almost every football shirt made today is built on polyester, and almost every explanation stops there — as though naming the fibre told you how the shirt will feel in August. It does not. The same polyester can be knitted into a dense, smooth cloth that holds heat or an open one that lets it go, and the composition label cannot tell those two apart.
Most modern football jerseys are made from polyester, usually as a knitted fabric rather than a woven one, and frequently with a small percentage of elastane for stretch. Cotton, which dominated for decades, has largely disappeared from match shirts because it absorbs and holds water. That is the composition answer, and it is the part most articles give you.
The more useful answer is that two shirts can carry an identical composition label and behave completely differently, because how a fabric is knitted matters at least as much as what it is knitted from. A 2025 study of four commercial football jersey fabrics found exactly this: all four were 100% polyester microfibre, and their airflow and heat behaviour still differed significantly from one another. The label said the same thing four times. The cloth did not.
Two different facts get printed on the same garment and confused constantly. Fibre composition is what the material is made of. Knit structure is how that material is looped together into cloth. Only the first one appears on the care label, and the second does much of the work.
A fibre is the raw strand — polyester, cotton, nylon, elastane. A knit structure is the geometry of how those strands are looped together to make cloth. The same yarn, run on different machine settings, produces fabrics with different thickness, different openness and different behaviour in heat.
This is why "it's polyester, so it breathes" does not follow. Polyester makes breathable fabric possible — it does not absorb much water, so it can move sweat rather than soak it up — but whether a particular shirt actually breathes depends on how open the knit is, how thick the fabric is, and what has been done to it afterwards.
The research is unusually clear on this point. Suhaimi and colleagues, publishing in the International Journal of Integrated Engineering in 2025, tested four commercial football jersey fabrics for hot and humid conditions. Every one of the four was 100% polyester microfibre. They differed only in knit structure — mini mesh, polar eyelet, eyelet and interlock — and the authors reported that structure had a statistically significant effect on comfort performance. The most open structure in their set, polar eyelet, showed the lowest thermal and water-vapour resistance and the highest air permeability of the four.
That is a finding about four specific fabrics tested under one set of conditions, not a law of nature. It is strong evidence that structure matters. It is not evidence that any fabric called "mesh" will outperform any fabric called "interlock", and the authors do not claim that.
The property that matters is how little water polyester holds. Cotton is absorbent by nature: it takes up sweat into the fibre itself, gets heavier, stays damp and dries slowly. In a warm stadium that is uncomfortable; in a cold one it is worse, because a wet shirt pulls heat out of you long after you have stopped running.
Polyester does close to the opposite. The fibre itself absorbs very little, so sweat tends to move along the surfaces of and between the filaments rather than soaking in — which is what people mean by wicking — and because the liquid is spread out rather than held, it evaporates faster. Polyester is also strong for its weight, holds dye well, resists stretching out of shape over a season, and is inexpensive to produce at scale.
None of that makes polyester automatically comfortable. A tightly knitted, thick polyester fabric with no finishing can trap heat perfectly well. The fibre removes one obstacle — water retention — and leaves the rest to construction.
A handful of knit structures account for most football shirts. The names are not standardised across the industry, and two manufacturers may use the same word for noticeably different cloth, but the families are recognisable.
The broad tendency is that more open structures pass more air and denser structures hold their shape better. That tendency is real, and it is also only a tendency: openness is one variable among several, and a thick open-knit fabric can easily be warmer than a thin dense one. Thickness, yarn, and finishing all push back on the trend.
Mesh is not simply better than interlock. They are solving different problems, and which is preferable depends on the climate, the position on the garment and the rest of the construction. A shirt that is mesh everywhere is not automatically a better shirt.
Microfibre describes fineness, not a different material. The polyester is spun into filaments much thinner than conventional ones, so a given weight of fabric contains many more, much finer strands — and therefore far more surface area and far more of the narrow channels between filaments along which liquid travels.
That extra channelling is the mechanism behind microfibre's reputation for moisture handling. Guru and Choudhary, testing three polyester types in the Journal of Textile and Apparel, Technology and Management in 2023, found their micro-polyester fabric managed moisture better than texturised polyester or a polyester-spandex blend, and attributed it specifically to having more capillary channels to move liquid from one face of the fabric to the other.
Finer filaments also make a softer, smoother-feeling cloth, which is why microfibre shirts often feel more pleasant against skin than older polyester at the same weight.
Plenty of football shirts are not 100% anything. The most common addition is a small proportion of elastane — sold as Spandex or Lycra — typically a few percent, which lets the fabric stretch and recover rather than deform. It matters most in closer-fitting garments, where a shirt with no give either restricts movement or has to be cut loose enough not to.
Blending is a trade rather than a free upgrade. Guru and Choudhary's polyester-spandex fabric did not match their micro-polyester on moisture management. Elastane also has its own care requirements, which is part of why hot washes and tumble drying are discouraged on sportswear.
A single shirt is also frequently several fabrics. The body, the sleeves, the side panels, the collar and the cuff trim can each be a different construction and sometimes a different composition, which is why a composition label occasionally lists more than one figure, or lists them per component.
"Moisture management" is a measurable property, not a marketing adjective. Textile laboratories assess how quickly liquid spreads on each face of a fabric and how readily it moves from the inner face to the outer one, because a fabric that moves sweat away from the skin and spreads it out on the outside dries faster and feels drier.
Three things drive it. The fibre decides how much water is absorbed rather than transported. The structure decides how much capillary channelling exists and how much air can reach the surface. And the finishing — chemical treatments applied after knitting — can change the behaviour substantially in either direction.
That last one is routinely left out. Guru and Choudhary tested four different finishes and found a moisture-management finish improved every moisture-management parameter they measured, along with air permeability, water-vapour permeability, wicking and drying — on fabric that was otherwise unchanged. An untreated polyester knit and a finished one made from the same yarn are not the same product, and nothing on a composition label distinguishes them.
This is the honest limit of what you can know from the outside. Composition is printed on the label. Structure you can often see and feel. Finishing is usually invisible, and it is a real variable.
Air permeability is how readily air passes through a fabric, and it is tested by pushing air through a specimen under controlled pressure and measuring what gets through. More airflow generally means heat and water vapour leave more easily, which is why open structures do well on this measure.
It is also only one of several properties that decide whether a shirt is comfortable. The 2025 jersey study measured thermal resistance, water-vapour resistance, water-vapour permeability and air permeability alongside moisture management, because a fabric can rate well on one and poorly on another. Comfort is a composite, and a single headline number does not capture it.
Context decides which properties matter. A fabric optimised for hot, humid conditions is being asked a different question from one intended for a cold evening, and the answer that wins in one setting is not the answer that wins in the other.
Beyond the cloth itself, how a garment is put together changes how it wears. Where the panels are placed decides where the more open fabric actually sits relative to your body. Seam construction decides whether a seam chafes under a strap or during a long run. Collar and cuff construction decides whether those edges keep their shape after a season.
Applied decoration matters too. A large solid print across the chest is a layer of material sitting on the fabric, and air does not pass through it the way it passes through the knit around it. That is a real effect on a heavily printed shirt, independent of what the base fabric would do on its own.
Fabric weight — often quoted in grams per square metre — is a genuine specification and a useful one when comparing two fabrics directly. There is no universal range that defines a proper football jersey, and anyone quoting one is describing a particular segment of the market rather than a standard.
The composition label is sewn into a side seam or behind the collar, and it is a regulated statement rather than marketing copy. It tells you what the garment is made of by percentage, in descending order.
The care label is also where garment care properly begins, and the symbols on it are worth being able to read:
No. Polyester is the dominant fibre in modern football shirts, but blends containing elastane are common, and a single shirt may use different fabrics for different panels. Check the label on the specific garment rather than assuming.
Polyester makes breathable fabric possible, because it absorbs little water and can move sweat rather than hold it. Whether a particular polyester shirt actually breathes depends on the knit structure, the thickness and the finishing. The fibre alone does not settle it.
Not inherently. Mesh is more open and generally passes more air; interlock is denser and generally more stable. Which is preferable depends on the climate, where on the garment the fabric sits, and the rest of the construction.
That the polyester filaments are unusually fine. More, thinner filaments mean more surface area and more capillary channels for moving liquid, which is why microfibre fabrics tend to handle moisture well and feel softer.
Cotton absorbs sweat into the fibre, becomes heavy and damp, and dries slowly. Those are exactly the properties you do not want during ninety minutes of exercise. Cotton is still perfectly good for a casual shirt worn off the pitch.
No. Grams per square metre is a weight, not a quality rating. A heavier fabric may be more durable and more opaque; a lighter one may be cooler. Which you want depends on the conditions you will wear it in.
Only partly. The label gives you composition, which rules some things in and out. It does not tell you the knit structure, the fabric weight, or whether any performance finish has been applied — and those are a large part of how the shirt will actually behave.
The two studies this article draws on, for readers who want the primary material. Both are summarised here in our own words; neither is reproduced.
FootVerse is an India-focused online retailer of football jerseys and sportswear. We publish The Football Journal because the questions we are asked most often deserve a fuller answer than a product page can give.
This article describes how football shirt fabrics work in general. It is not a specification for any particular garment, ours included — for that, read the label sewn into the shirt in front of you.