Activewear Fabrics: A Sourcing Guide for Buyers and Brands
The most common fabrics used in activewear are polyester, nylon, and spandex (elastane), often blended for stretch, moisture management, and durability. Recycled polyester, bamboo viscose, and merino wool are growing in demand as brands prioritize sustainability. The right fabric depends on the garment type, performance requirements, price point, and your target market.
If you are developing an activewear line or sourcing performance apparel from a manufacturer, fabric selection is one of the first and most consequential decisions you will make. It affects everything from how the garment feels and performs to your unit cost, minimum order quantities, and lead times.
This guide covers the most widely used activewear fabrics, what makes each one suitable for different products, and the practical sourcing considerations that come with each choice.
Updated Febrary 27, 2026
| Fabric | Best For | Key Properties | Relative Cost | Common Certifications |
|---|---|---|---|---|
| Polyester | Gym tops, running gear, team jerseys | Moisture-wicking, durable, quick-dry | $ Low to mid | Oeko-Tex GRS |
| Nylon | Leggings, sports bras, compression wear | Soft hand feel, stretch, abrasion-resistant | $$ Mid | Oeko-Tex bluesign |
| Spandex (Elastane) | Blended into most activewear | Four-way stretch, shape retention | $$ Mid (in blends) | Oeko-Tex |
| Recycled Polyester (rPET) | Eco-conscious lines, brand positioning | Same performance as virgin poly | $$ Mid to high | GRS Oeko-Tex |
| Bamboo Viscose | Yoga wear, athleisure, base layers | Soft, breathable, odor-resistant | $$ Mid to high | FSC Oeko-Tex |
| Merino Wool | Outdoor, cold-weather base layers | Temperature-regulating, odor-resistant | $$$ High | RWS Oeko-Tex |
Polyester: The Workhorse of Activewear
Polyester is the most widely used fabric in activewear manufacturing globally, and for good reason. It is lightweight, dries quickly, holds color well through repeated washing, and is one of the most cost-effective performance fabrics available. The majority of gym tops, running shirts, team jerseys, and casual athletic tees are made from polyester.
For sourcing purposes, polyester is also one of the easiest fabrics to work with. It is widely available from mills across Vietnam, China, Taiwan, and South Korea, which means factories typically have reliable access to stock polyester knits in common weights (140 to 200 GSM for most activewear). This availability keeps MOQs and lead times manageable compared to specialty fabrics.
Where Polyester Falls Short
Polyester can retain odors over time because bacteria cling to its surface. This is why many activewear brands request anti-microbial finishes or silver-ion treatments during production. These finishes add cost but are becoming standard in mid-range and premium activewear. Polyester also lacks the soft hand feel of nylon, which is why it is less common in skin-tight garments like leggings and sports bras, where touch matters.
Typical Blends
Most activewear polyester is blended with 5% to 20% spandex for stretch and recovery. A standard running shirt might be 88% polyester / 12% spandex at 160 GSM. For hoodies and fleece-lined activewear, brushed polyester fleece (typically 280 to 320 GSM) is the standard construction.
Nylon: The Premium Feel Fabric
Nylon is the go-to fabric when a brand wants activewear that feels noticeably smoother and softer against the skin. It is the dominant base fabric in leggings, yoga pants, sports bras, and compression garments. If you have ever compared a basic polyester legging to a premium one and noticed the difference in hand feel, the premium version is almost certainly nylon-based.
Nylon is also more abrasion-resistant than polyester, which matters for garments that experience friction during movement (inner thighs on leggings, underarms on fitted tops). It accepts dye well and produces deeper, more saturated colors.
Sourcing Considerations for Nylon
Nylon generally costs more per meter than polyester, and the price gap widens for specialty nylon such as nylon 6,6 (often used in higher-end compression wear). Vietnamese activewear factories commonly source nylon from Taiwan and South Korea, where the major performance fabric mills are located. This means your fabric lead time may be longer than with locally milled polyester, particularly for custom fabric development.
Typical Blends
Nylon activewear is almost always blended with spandex. A standard legging construction is 75% to 80% nylon / 20% to 25% spandex at 230 to 280 GSM, depending on compression level. Lower spandex percentages (around 15%) work for lighter-weight tops and bralettes.
Spandex (Elastane/Lycra): The Stretch Component
Spandex is rarely used as a standalone fabric. Instead, it is blended into polyester or nylon base fabrics to provide stretch and recovery. When a garment is described as having "four-way stretch," that performance comes from the spandex content in the fabric blend.
The amount of spandex in a blend directly affects how the garment performs. Lower percentages (5% to 10%) provide a moderate stretch suitable for t-shirts and casual athleisure. Higher percentages (15% to 25%) deliver the compression and recovery needed for leggings, sports bras, and performance tights.
What Buyers Should Know
The spandex percentage you specify in your tech pack directly impacts fabric cost and hand feel. Higher spandex content increases cost and can also make the fabric feel warmer, which is worth considering for garments designed for hot-weather training. It is also worth noting that spandex degrades over time with repeated washing and heat exposure, so garment care instructions should reflect this.
Recycled Polyester (rPET): Sustainability with Performance
Recycled polyester, often made from post-consumer PET bottles, has become one of the fastest-growing fabric choices in activewear. From a performance standpoint, it functions identically to virgin polyester: same moisture-wicking, same durability, same dyeability. The difference is in the story and certification behind it.
For brands positioning around sustainability, rPET provides a tangible claim backed by third-party certification (typically GRS, the Global Recycled Standard). Many activewear manufacturers in Vietnam now offer GRS-certified recycled polyester as a standard option, particularly factories that supply international brands with sustainability commitments.
Sourcing Considerations for Recycled Polyester
Recycled polyester typically costs 10% to 25% more than virgin polyester, depending on the certification level and the supplier. GRS certification requires chain-of-custody documentation from yarn to finished garment, so your factory needs to be GRS-certified as well, not just the fabric mill. Availability has improved significantly over the past few years, but custom rPET colors may carry higher MOQs than standard polyester.
Bamboo Viscose: Softness and Sustainability Positioning
Bamboo fabric used in activewear is almost always bamboo viscose (a regenerated cellulose fiber), not raw bamboo fiber. The distinction matters because the chemical processing required to convert bamboo pulp into a wearable textile is similar to that used in conventional viscose production. Brands making sustainability claims around bamboo should understand this and ensure their marketing is accurate.
That said, bamboo viscose has genuinely useful properties for certain activewear categories. It is naturally soft (comparable to modal), breathable, and inherently odor-resistant, reducing the need for chemical antimicrobial treatments. It works well for yoga wear, studio-to-street athleisure pieces, and lighter base layers.
Sourcing Considerations for Bamboo
Bamboo viscose is more fragile than polyester or nylon, which means it pills more easily and has a shorter garment lifespan under heavy use. It is generally not suitable for high-intensity activewear where abrasion resistance matters. Factories sourcing bamboo viscose typically import it from Chinese mills, though some Vietnamese and Indonesian suppliers are increasing capacity. Expect higher MOQs for custom bamboo blends compared to standard polyester or nylon options.
Merino Wool: The Outdoor Performance Fiber
Merino wool occupies a niche in activewear, but an important one. It naturally regulates temperature (insulating in cold weather and breathing in warm conditions), resists odor far better than any synthetic, and feels soft against the skin. These properties make it the fabric of choice for outdoor base layers, hiking tops, and cold-weather running gear.
Sourcing Considerations for Merino
Merino is the most expensive fabric on this list and is sourced almost exclusively from Australia and New Zealand. Vietnamese factories that produce merino activewear import the yarn or fabric, and custom merino knits carry significant MOQs (often 1,000+ meters of fabric before cutting). Merino is most practical for established brands with proven demand in the outdoor or premium activewear segment rather than for startups testing their first collection.
How to Specify Activewear Fabrics on a Tech Pack
When working with a manufacturer, your tech pack is where fabric decisions become concrete. A vague fabric description like "moisture-wicking stretchy material" will result in the factory choosing whatever is cheapest and available. Specific callouts get you the fabric you actually want.
Key Specifications to Include
Your tech pack should clearly state the fiber composition and percentages (for example, 80% nylon / 20% spandex), the target weight in GSM, the required stretch direction (two-way or four-way), and any performance finishes (anti-microbial, UV protection, DWR for water resistance). If you need a specific certification (GRS, Oeko-Tex, GOTS), state it on the tech pack so the factory knows before quoting.
Color and Finish Details
Include Pantone references for colors, and specify whether you need a matte, semi-gloss, or brushed finish. For sublimation-printed activewear, the base fabric must be white polyester or a polyester-dominant blend, as sublimation does not work on nylon or natural fibers.
Stock Fabric vs. Custom Fabric Development
One of the most impactful decisions in activewear sourcing is whether to use a factory's stock fabric or develop a custom fabric from scratch.
Stock Fabric
Most factories maintain relationships with fabric mills and can offer a range of ready-made fabrics in common compositions and weights. Using stock fabric keeps MOQs lower (you are ordering garments, not fabric), shortens lead times, and reduces upfront development costs. For brands launching their first collection or testing a new product, stock fabric is usually the practical choice.
Custom Fabric Development
Custom development means specifying a unique composition, weight, finish, or color that the mill produces to your exact requirements. This gives you a differentiated product but comes with higher fabric MOQs (often 1,000 to 3,000 meters per color), longer development timelines (two to four months for sampling and approval), and higher costs. Custom fabric makes sense for established brands with consistent volume and a clear need for a proprietary hand feel or performance profile.
Where Factories Source Their Fabrics
Understanding where your factory gets its fabric helps you anticipate lead times and potential supply chain issues. For activewear produced in Vietnam, the fabric supply chain typically looks like this:
Domestic Vietnamese Mills
Vietnam has a growing capacity in circular-knit polyester and cotton jersey. Many Vietnamese clothing manufacturers either operate their own knitting facilities or have long-standing relationships with domestic mills. Domestically sourced fabric keeps lead times shorter and gives factories more flexibility on smaller runs.
Imported Performance Fabrics
For higher-end activewear (particularly nylon-based fabrics, compression knits, and specialty performance textiles), factories typically import from Taiwanese and South Korean mills. These countries are home to the world's leading performance textile producers and supply the same fabrics used by major global brands. The tradeoff is longer fabric lead times (four to eight weeks for stock, longer for custom) and higher minimum fabric orders.
Fabric Origin and Trade Compliance
If you are importing into a market covered by a free trade agreement (such as the CPTPP or EVFTA), fabric origin can affect your tariff eligibility. Some agreements require "yarn-forward" rules of origin, meaning the fabric must be produced in a qualifying country. This is worth discussing with your sourcing partner early, especially if preferential tariff rates are part of your cost calculation.
For a broader look at which countries are best suited for activewear production and why, see our guide to the best countries for activewear sourcing.
Cosmo Sourcing: Your Activewear Fabric and Manufacturing Partner
Choosing the right fabric is only one piece of the activewear sourcing puzzle. You also need a factory that can handle construction, a clear quality standard, and someone on the ground to ensure production matches the sample you approved.
Cosmo Sourcing connects brands with vetted activewear manufacturers across Vietnam and other production hubs. We work on a flat-fee model, so our recommendations are based on what is right for your product, not on commission from the factory. Our team has sourced thousands of products across every major activewear category, from leggings and sports bras to performance outerwear, and we coordinate everything from factory matching and sample development through production oversight and final quality checks.
If you are developing an activewear line and need help navigating fabric choices, factory selection, or the sourcing process, reach out to us at info@cosmosourcing.com or visit cosmosourcing.com/contact-us.
