Research
Moisture-Wicking Fabrics: What the Research Actually Shows
"Moisture-wicking" describes fabrics that move sweat away from the skin so it can evaporate, rather than absorbing and holding it. The physics is real: synthetic fibers like polyester barely absorb water (a moisture regain of about 0.4%, versus 8.5% for cotton) and instead pull liquid along fiber surfaces by capillary action. That keeps a shirt feeling drier. But the research also shows a trade-off: after exercise, polyester tends to smell worse than cotton, because odor-related bacteria grow more readily on it. This page traces the fabric-science evidence to its sources.
By the Sweat Explained Editorial Team · Published 2026-07-13 · Last reviewed 2026-07-13 · Educational information, not medical advice.
Key statistics at a glance
0.4% vs 8.5%
moisture regain of polyester versus cotton: polyester holds far less water
ACS ChemMatters 2022
−2.04 vs −0.61
odor pleasantness (scale −4 to +4) of polyester vs cotton T-shirts after a 1-hour spin class: polyester rated significantly less pleasant
Callewaert 2014
P = 5.7×10⁻⁶
significance of the overall odor difference between polyester and cotton shirts after exercise
Callewaert 2014
Micrococcus
odor-linked bacteria enriched almost solely on the synthetic shirts, not on cotton
Callewaert 2014
10 runners
wear trial comparing five fabrics; a polyester mesh and a Tencel jersey managed skin moisture best
Özkan 2023
What "wicking" actually means
Fabrics differ in how much water they hold. Textile engineers measure this as moisture regain: the mass of water a saturated fabric retains divided by its dry mass. Cotton, made largely of cellulose with polar hydroxyl groups that hydrogen-bond to water, has a standard moisture regain of about 8.5%. Polyester, whose fibers are essentially non-polar, sits near 0.4%. A cotton-polyester 50/50 blend falls in between at roughly 4.45% (values from the American Chemical Society's ChemMatters).
Because polyester barely absorbs water, sweat stays on the fiber surface, where narrow channels between fibers pull it along by capillary action, the same effect that lets a paper towel draw up water. The liquid spreads across a larger area and evaporates faster, so the fabric feels drier against the skin. A purely water-repellent fiber would not wick either, though; some attraction to water is needed for capillary flow, which is why fabric structure (knit, mesh, blend) matters as much as fiber choice.
How much water each fabric holds
Moisture regain is the clearest single number behind the wicking claim: the lower it is, the less water the fabric absorbs and retains. These are standard published values for common fibers.
| Group | Value |
|---|---|
| Polyester | 0.4% |
| Nylon | 4% |
| Cotton/polyester 50/50 | 4.45% |
| Cotton | 8.5% |
| Wool | 16% |
Source: Rohrig B, "Don't Sweat It," ACS ChemMatters, Oct 2022. Chart is an original rendering of the cited data.
Does drier mean more comfortable? The wear-trial evidence
Feeling dry and staying cool are related but not identical. In a 2023 wear-trial study, ten long-distance runners each exercised in five different T-shirts: 100% cotton, a 50/50 cotton-polyester, a textured polyester jersey, a polyester mesh, and a Tencel (regenerated cellulose) jersey, while researchers measured the microclimate (temperature and humidity) at four points on the body.
The cotton shirt retained the most sweat and the textured polyester the least. But the standout performers for keeping the skin's microclimate cool and dry were the polyester mesh and the Tencel jersey; athletes in those two also showed lower oxygen uptake and heart rate during submaximal running. The lesson is that a fabric's construction, an open mesh that lets heat and moisture escape, matters alongside the fiber itself. Notably, Tencel is a cellulosic fiber like cotton, yet performed well, so "synthetic always wins" is too simple a summary.
The odor trade-off
The best-documented downside of synthetics is smell. In a controlled 2014 study, 26 volunteers (13 men, 13 women) did an hour of intensive indoor cycling wearing cotton or polyester T-shirts. After the shirts were incubated, a trained odor panel judged the polyester shirts significantly less pleasant, a mean hedonic score of −2.04 (on a −4 to +4 scale) versus −0.61 for cotton, and more intense, musty, ammonia-like, sweaty and sour. The overall difference between fabrics was highly significant (P = 5.72×10⁻⁶).
The microbiology explained why. Micrococcus bacteria, associated with malodor, were isolated from almost all the synthetic shirts and detected almost solely on synthetics; Staphylococcus grew on both fabrics; and Corynebacterium, the main driver of underarm odor on the skin itself, was not enriched on either textile. In other words, the shirt develops its own smell profile that differs from the armpit's.
Cotton vs polyester: what the evidence supports
A neutral, evidence-based summary of where each fabric measurably differs. This is about fabric behavior, not a product recommendation.
| Property | Cotton | Polyester |
|---|---|---|
| Moisture regain (water held) | ~8.5% | ~0.4% |
| Handling of sweat | Absorbs and holds it (feels wet) | Wicks it to the surface to evaporate (feels drier) |
| Odor after exercise | Rated more pleasant | Rated significantly less pleasant |
| Odor-linked bacteria | Fewer Micrococcus | Micrococcus enriched almost solely here |
Moisture regain: ACS ChemMatters. Odor and bacteria: Callewaert 2014. Cotton and polyester also come in many constructions, which affect real-world comfort.
How to read this in plain terms
Two things are true at once. Polyester genuinely moves sweat off the skin better than cotton, so it can feel drier and cooler during activity, an effect supported by moisture-regain physics and wear-trial microclimate data. And polyester also tends to smell worse afterward, because odor-associated bacteria colonize it more readily. Neither finding makes one fabric universally "better"; they describe a measured trade-off between dryness and odor. Fabric construction (mesh, knit, blends) and laundering also shape the everyday result.
Methodology and limitations
This page draws on a peer-reviewed microbiology study of post-exercise clothing odor (Callewaert 2014, Applied and Environmental Microbiology), a peer-reviewed wear-trial of five garments in runners (Özkan 2023, Scientific Reports), and standard textile moisture-regain values published by the American Chemical Society's ChemMatters (Rohrig 2022). Each figure was traced to its source and confirmed.
Limitations: the odor study used 26 volunteers and indoor cycling, and judged incubated whole shirts, not underarm regions specifically; results may not generalize to every synthetic blend or garment. The wear trial involved only ten male runners and five specific fabrics, so its microclimate findings are not a ranking of all cotton versus all polyester. Moisture regain is a standard laboratory property of fibers, not a direct measure of comfort. These are associations from small controlled studies, not clinical outcomes, and nothing here is medical advice.
Frequently asked questions
- What does moisture-wicking actually do?
- It moves sweat from the skin to the fabric's outer surface, where it spreads out and evaporates faster, so the fabric feels drier. Polyester does this well because it barely absorbs water (moisture regain ~0.4% versus ~8.5% for cotton) and instead moves liquid by capillary action.
- Is polyester really better than cotton for sweat?
- For staying dry during exercise, the evidence favors polyester and open synthetic-mesh constructions, which hold less sweat and keep the skin microclimate drier (Özkan 2023). But a Tencel cellulosic fabric also performed well, so construction matters as much as fiber, and there's a trade-off on odor.
- Why do synthetic workout clothes smell worse?
- In a controlled study, polyester shirts were rated significantly less pleasant than cotton after an hour of cycling, and odor-linked Micrococcus bacteria were found almost solely on the synthetic shirts (Callewaert 2014). Polyester's surface appears to favor these bacteria more than cotton does.
- Does the smell come from my armpit or the shirt?
- The study found the shirt develops its own odor profile. Corynebacterium, the main cause of underarm odor on skin, was not enriched on either fabric, while Micrococcus, largely absent from the armpit swabs, flourished on polyester. The garment's smell is not simply transferred from the skin.
- Does moisture-wicking fabric lower my body temperature?
- It mainly affects skin-level comfort, how cool and dry the fabric feels, rather than core temperature. Wear-trial data show cooler, drier microclimates and lower perceived strain with breathable fabrics, but such studies generally find little change in core body temperature between fabrics.
- Is heavy sweating just a fabric problem?
- No. Fabric choice affects comfort and odor, not how much you sweat. Persistent, excessive sweating that disrupts daily life is worth discussing with a clinician, since it can have treatable causes.
Sources
Primary peer-reviewed studies and official sources first, then reviews and institutional framing (secondary).
- Callewaert C, De Maeseneire E, Kerckhof FM, Verliefde A, Van de Wiele T, Boon N. Microbial odor profile of polyester and cotton clothes after a fitness session. Appl Environ Microbiol. 2014;80(21):6611–6619. PMID 25128346. Full text
- Özkan ET, Kaplangiray B, Şekir U, Şahin Ş. Effect of different garments on thermophysiological and psychological comfort properties of athletes in a wear trial test. Sci Rep. 2023;13:14883. doi:10.1038/s41598-023-42085-2. Full text
- Rohrig B. Don't Sweat It: How Moisture-Wicking Fabrics Keep You Cool and Dry. ChemMatters, American Chemical Society. October 2022 (moisture regain values). (secondary) PDF
How to cite this page
Sweat Explained. Moisture-Wicking Fabrics: What the Research Actually Shows. Published 2026-07-13; last reviewed 2026-07-13. Available at: https://sweatexplained.com/research/moisture-wicking-fabrics-evidence
Please cite the original studies for the underlying figures. Journalists are welcome to link to this page; the charts are original renderings of the cited data.