Polyester dries quickly but feels like plastic, cotton is comfortable but wrinkles easily? This article tells you how to choose

When reading fabric specification sheets, most people first look at the hand feel—whether it's soft, smooth, or has a cool touch. That's fine; we fabric developers also start by touching. But after touching, you need to know: hand feel does not equal performance. Polyester treated with softeners can feel like cotton, but once you wear it and sweat, it still feels stuffy. Conversely, untreated cotton may feel stiff, but when you sweat, it will at least absorb moisture.

So this article does not discuss hand feel; it discusses the underlying properties—what the fiber itself determines.

Fiber Classification: Not All "Man-Made Fibers" Are the Same

The textile industry divides fibers into two main categories: natural fibers and chemical fibers. Chemical fibers are further divided into two types—regenerated fibers and synthetic fibers.

Here's a common point of confusion: viscose, modal, and lyocell are regenerated fibers, not synthetic fibers. Their raw material is wood pulp, which is "plant-derived," but they require chemical processing to be spun. Many people call them "chemical fibers," which is not strictly accurate—"chemical fibers" in everyday language covers both regenerated and synthetic fibers, which are two completely different material lines. Treating viscose like polyester will lead to completely opposite conclusions.

Performance Comparison: Four Indicators to Clarify Fundamental Differences

Fabric performance can be listed in dozens of indicators, but for material selection, only a few truly determine the outcome. Let's look at them one by one.

Moisture Absorption (Official Moisture Regain)

Whether water molecules can penetrate the fiber's interior is called moisture absorption, measured by official moisture regain—the percentage of moisture absorbed by the fiber relative to its dry weight under standard atmospheric conditions (20°C, 65% relative humidity). The higher the number, the stronger the moisture absorption.

Fibers with a moisture regain below 5% absorb water mainly through capillary action in the fiber gaps, not through the fiber itself. This explains the classic phenomenon: a pure cotton T-shirt sticks to the skin when wet, while a pure polyester sports jersey feels cool and dries quickly when sweaty. It's not that cotton is bad—cotton absorbs sweat but does not wick it away; moisture remains in the fiber and evaporates slowly. Polyester does not absorb sweat; sweat is conducted through fiber gaps to the fabric surface and evaporates, which is how the quick-dry effect works.

This is also why a polyester shirt and a cotton shirt on the same summer walk result in the former having a dry back while the latter has a large wet patch but feels "not stuffy"—because cotton really absorbs moisture, but it just can't release it quickly enough.

Strength and Durability

One often overlooked point: viscose loses half its strength when wet. Skirts and T-shirts made of viscose fabric can easily develop holes if washed improperly—for example, by wringing forcefully while wet or using hot water. This is not a quality issue; it's determined by viscose's chemical structure.

Nylon ranks first in abrasion resistance among common fibers, which is why it is frequently used in wear-resistant areas of outdoor jackets and load-bearing parts of hiking backpacks. Polyester also has high strength, but when polyester is made into micro-denier (very fine fibers), its strength naturally decreases—this is a physical law, not a quality problem.

Shrinkage

Shrinkage depends on two factors: the fiber's degree of water absorption and swelling and the internal stress accumulated during weaving, dyeing, and finishing.

From a purchasing perspective, seeing "shrinkage ≤3%" on the care label of cotton clothing is normal and meets national standards (GB/T 22853 for knitted T-shirts typically requires longitudinal shrinkage not to exceed a specific value; after pre-shrinking, cotton fabrics can usually be controlled within 3-4%). Shrinkage does not necessarily mean "poor quality." The purpose of pre-shrinking is to complete the shrinkage in the factory. Cotton fabric that hasn't been pre-shrunk will shrink after the first wash and then stop shrinking significantly.

For viscose and flax, don't expect no shrinkage at all. Even with pre-shrinking, the shrinkage rate remains high. When buying clothes made of these materials, leave some allowance in the fit.

Heat Resistance and Care

Wool's felting shrinkage is a unique issue: hot water + mechanical force + alkaline conditions can destroy the scale layer of wool fibers, causing them to tangle and shrink. In other words, if you throw a wool sweater into a washing machine with hot water, it may come out as a child's size. That's not just a warning on the care label.

Blending: Why There Are Few "Pure" Fabrics

Now that we've covered the properties of individual fibers, the next natural question is: can we combine the advantages of different fibers? That's the logic of blending.

Blending is not random; it has clear purposes:

Here's a rule of thumb: Fibers blended at a ratio above 5% can consistently change fabric hand feel. Below 3%, it's mostly for marketing claims and the actual feel is not noticeable.

Another point that needs to be stated honestly: Blending makes recycling more difficult. For polyester-cotton blended clothing, mechanical recycling is nearly impossible after disposal—the two fibers are entangled, and the separation cost exceeds the cost of new fibers. According to a 2025 report by Textile Exchange, globally in 2024, less than 1% of fibers were actually recycled from waste textiles, with blending being the biggest technical obstacle. While this data does not directly affect current season procurement, if you are working on ESG-oriented product lines, keep this in mind.

Another Truth About Synthetic Fibers: How Moisture Wicking Works

The market is full of "moisture-wicking" polyester sportswear. But as mentioned earlier, polyester itself has a moisture regain of only 0.4% and is basically non-absorbent.

So how does it achieve "wicking"? The answer is through physical structure, not chemical absorption.

There are three main methods:

Profiled cross-sections: Changing the cross-section of polyester filaments from round to cross-shaped, Y-shaped, or H-shaped. When these profiled fibers are arranged together, they form numerous micro-grooves between them. Sweat quickly spreads along these grooves to the fabric surface via capillary action for evaporation. This is physical moisture wicking, not chemical absorption.

Hydrophilic finishing treatment: Adding hydrophilic coatings to the fabric surface and fiber gaps to make water spread more easily and accelerate evaporation. The limitation is that the treatment wears off after a few washes, so durability is lower than profiled cross-section solutions.

Microfiber: The finer the fiber, the more fibers per unit area, the denser the capillary channels, and the faster the moisture wicking speed.

These three methods can be combined, but more is not always better. Excessive hydrophilic treatment can make the hand feel greasy, and making microfibers too fine reduces strength. I've discussed the key points of balancing physical performance and hand feel during production in a previous article on fabric development. If you're interested, check it out: Fabric Development 101: From Fiber Selection to Functional Implementation.

Lyocell: Excellent Moisture Absorption, But With Its "Achilles' Heel"

Lyocell (Tencel) has been widely used in high-end home textiles and casual wear in recent years, with high market acceptance. Its raw material is wood pulp, produced using a closed-loop NMMO solvent process with a solvent recovery rate of over 99.5%, making it the best-performing regenerated cellulose fiber in terms of full-chain environmental indicators.

In terms of performance: moisture absorption is close to cotton (official moisture regain 11%), breaking strength 3.8-4.2 cN/dtex, wet strength retention 80-85%, making it the strongest among regenerated fibers, closest to polyester. It has a smooth hand feel and is suitable for summer wear and underwear due to its moisture-wicking properties.

But lyocell has a unique issue called fibrillation—when the fiber comes into contact with water, its surface splits into fine micro-fibrils, creating a fuzzy texture that increases with washing. During the development process, the final product's style requirements must be clearly defined from the fiber selection stage. For a smooth fabric surface, choose low-fibrillation grade lyocell.

Purchasing Decision: Consider the Occasion, Not the Marketing Copy

Back to the most practical question: when you look at the care label of a garment and see the blend ratio on the composition tag, how do you judge whether it suits your scenario?

Daily commute, office, casual settings: Cotton, cotton/modal blends, or lyocell/cotton blends are sufficient. These materials have good moisture absorption and are skin-friendly, comfortable for 8-10 hours of wear without major issues. Don't insist on pure cotton—pure cotton clothes show more wrinkles at the collar and cuffs by the end of the day compared to blends. A cotton/polyester 65/35 shirt is noticeably more crisp than pure cotton.

Sports, outdoor, high-temperature settings: Do not choose pure cotton. Cotton absorbs sweat and sticks to the skin; sweat evaporation removes body heat, which is fine outdoors, but in an air-conditioned room, wet clothes sticking to your back can cause chills. Opt for polyester sport fabrics or nylon/spandex blends, which wick moisture quickly and dry fast. Pay attention to fabric weight (GSM) and mesh structure—breathability comes more from the fabric's porosity than the fiber itself.

Rainy, humid conditions: Waterproof nylon or polyester fabrics (with PU coating or lamination). Cotton absorbs water in humid conditions, becomes heavy, and is prone to mildew over time.

High-end formal occasions: Wool, silk, or lyocell blends. The luster, drape, and crispness of these materials cannot yet be fully replicated by synthetic fibers. A wool/polyester 70/30 suit fabric maintains wool's hand feel while being less prone to wrinkles.

Common Cognitive Biases

"Pure cotton is always better than polyester"—It depends on the use. For sportswear, outdoor gear, and workwear, polyester's performance is superior to pure cotton. Pure cotton absorbs sweat but doesn't wick it away, which is a drawback in sports scenarios.

"Modal is a natural fiber"—No. Modal's raw material is natural beech wood pulp, but it undergoes chemical processing to be spun, making it a regenerated fiber. The label says "regenerated cellulose fiber," not "natural fiber."

"Viscose is like artificial cotton, same as cotton"—The hand feel is indeed close to cotton, even softer and smoother. But viscose loses half its strength when wet, which is the biggest difference from cotton. Viscose fabric is crisp when dry but becomes limp after washing.

"Lyocell is a type of polyester"—Not at all. Lyocell is a regenerated cellulose fiber with moisture absorption close to cotton. Polyester is a synthetic fiber with near-zero moisture absorption. Their raw materials, production processes, and performance characteristics are completely different.

"Recycled polyester means eco-friendly fabric"—Recycled polyester reduces petroleum dependency from the raw material source (recycled PET bottles), which is fine. However, the issue of microplastic fiber shedding during washing is not solved, and recycled polyester may actually shed more microplastics due to shorter fibers. This topic is discussed in more detail in a dedicated article on sustainable fabric technologies.

"Higher fabric weight (GSM) means better quality"—Higher GSM doesn't necessarily mean better. Some factories increase overfeed during setting to make the fabric feel thicker, resulting in a soft surface but revealing the true density after the first wash. Truly good fabric matches GSM with density; it's not just about weight.

Global Production Data Overview

Looking at macro data can give you a more comprehensive perspective when selecting materials:

• According to Textile Exchange's 2025 Global Fiber Materials Trends Report, total global fiber production in 2024 was approximately 132 million tons, nearly doubling over 20 years (about 58 million tons in 2000). Per capita fiber consumption grew from 8.3 kg in 1975 to 16.2 kg in 2024.

• Synthetic fibers accounted for 69% of global fiber production, with polyester at 59% (about 77.7 million tons), nylon at about 7 million tons (5%). Cotton accounted for 19% (about 24.5 million tons). Man-made cellulosic fibers (MMCF, including viscose, modal, lyocell) made up 6% (about 8.4 million tons), with viscose fiber accounting for 80% of MMCF. Animal fibers were about 1%.

• According to COMTRADE customs data, in 2024, China's exports of man-made filament (HS Chapter 54) were US$29.7 billion, and man-made staple fibers (HS Chapter 55) were US$13.7 billion. The export scale of man-made fiber fabrics far exceeds that of natural fibers.

• On the consumer side, fast fashion brands use about 80% polyester or polyester-cotton blends, driven by cost. Mid-to-high-end brands tend to use natural or regenerated fibers such as cotton, lyocell, and wool blends to enhance feel and quality.

Raw material price fluctuations have a direct impact on the fiber market. Cotton prices are heavily influenced by global climate and policies (such as planting subsidies, import tariffs), while polyester prices are significantly affected