Fabric Types for Activewear: The Complete Guide to Performance Materials

One of the most consistent problems I see when brands are developing their first activewear line is fabric selection done wrong. Either they're spec'ing a fabric based on how it feels in a showroom, not how it performs in a workout. Or they're letting the manufacturer choose the fabric without understanding what they're actually getting. Or they're choosing the cheapest option available and discovering later why it was cheap.

Fabric is the foundation of activewear. Get it right and everything else is execution. Get it wrong and no amount of good design or branding will save you from returns and bad reviews.

The Core Performance Fibers

Polyester

Polyester is the dominant fiber in modern activewear for good reasons. It's inherently moisture-wicking (the fiber doesn't absorb water the way natural fibers do, so moisture passes through to the fabric surface where it evaporates), it's durable, colorfast, and relatively inexpensive.

The issue with basic polyester is odor retention. The same properties that make it moisture-resistant allow odor-causing bacteria to accumulate. This is why performance polyester fabrics typically include antimicrobial treatments.

Recycled polyester (rPET) — made from recycled plastic bottles — is increasingly popular as brands respond to sustainability concerns. Performance properties are equivalent to virgin polyester. The recycled story resonates with consumers.

**Key specifications to look for:**

Nylon (Polyamide)

Nylon is softer and more silky in feel than polyester, with excellent abrasion resistance. It's the preferred fiber for premium activewear leggings, swimwear, and any garment where skin-feel is a priority.

Nylon is more expensive than polyester and has slightly lower moisture-wicking performance, but for brands targeting the premium or luxury activewear segment, the tactile difference matters.

Nylon 6 vs Nylon 6,6 — two variants with slightly different properties. Nylon 6,6 has slightly better abrasion resistance and thermal stability; Nylon 6 (used in brands like Econyl recycled nylon) is more easily recycled. The practical difference for most activewear applications is minimal.

Spandex (Elastane/Lycra)

Spandex is the stretch fiber that makes athletic garments functional. Pure spandex is never used as a standalone fabric — it's always blended with polyester, nylon, or cotton to add stretch and recovery.

The percentage of spandex in a blend determines stretch characteristics:

Recovery is as important as stretch. A fabric that stretches well but doesn't recover fully will bag out at the knees, seat, and elbows. Always test recovery — stretch the fabric sample repeatedly and see how completely it returns to its original dimensions.

Lycra is DuPont's brand name for their spandex fiber. It's the premium standard. Cheaper elastane alternatives may have lower recovery performance, particularly after repeated washing.

Cotton and Cotton Blends

Cotton in activewear is a more nuanced topic than it was ten years ago. Pure cotton is generally not appropriate for high-performance athletic wear — it absorbs moisture heavily, takes a long time to dry, and becomes cold and clammy when wet.

However, cotton remains dominant in lifestyle athletic and athleisure categories where comfort and aesthetics matter more than performance. A cotton-blend training t-shirt that's worn for casual gym use and daily wear is perfectly appropriate.

Cotton/polyester blends (typically 60/40 or 50/50) represent a middle ground — better moisture management than pure cotton, better feel than pure polyester. These are the workhorses of casual athletic wear.

Ring-spun cotton produces softer, stronger yarns than open-end spun cotton. For any cotton activewear aiming at a premium feel, specify ring-spun.

Combed cotton takes ring-spun further by combing out shorter fibers, producing an even softer and stronger yarn. This is the specification for premium t-shirts and casual athletic wear.

Fabric Constructions: Knits and Wovens

The fiber is one dimension of fabric specification; the construction is the other.

Knit Fabrics

Most activewear uses knit fabrics because they inherently stretch without requiring elastic blend fibers.

Jersey knit is the basic single-layer knit. Lightweight, smooth on one side, textured on the other. The foundation of most athletic t-shirts and casual activewear tops.

French terry has loops on the inside and smooth on the outside. The loops create a slightly insulating, comfortable interior feel while the exterior looks clean. Standard for sweatshirts, hoodies, and mid-layer athletic wear.

Fleece — either brushed on one or both sides — has a soft, insulating feel. Used for cold-weather training gear, warm-up jackets, and athleisure.

Double knit / Interlock uses two interlocked jersey layers. Heavier and more stable than single jersey, with a smooth surface on both sides. Used for compression garments and high-quality athletic shorts.

Piqué has a textured, raised knit pattern on the surface. Classic for polo shirts and some training tops.

Woven Fabrics in Activewear

Wovens appear in activewear mainly as shell fabrics in jackets, shorts, and technical outerwear where structure and weather resistance are priorities.

Ripstop nylon/polyester — a plain woven fabric with a reinforcing thread in a grid pattern. Strong, lightweight, and tear-resistant.

Stretch wovens incorporate spandex into the weave for mobility without sacrificing structure.

Key Performance Properties and How to Specify Them

When working with a manufacturer, don't just specify a fiber type — specify the performance properties you need:

Moisture management — ask for AATCC 195 test results (liquid moisture management) or equivalent.

Stretch and recovery — specify minimum elongation percentage and maximum residual stretch after N cycles.

Colorfastness — ISO 105-C06 (washing), ISO 105-X12 (rubbing), ISO 105-B02 (light).

Antimicrobial performance — if specified, ask for test data showing efficacy after 50+ wash cycles.

Weight (GSM) — specify the gsm range appropriate for your product category.

We help clients select the right fabrics for their activewear programs from the start of development. Explore fitness wear to see how these materials translate into finished products, or get a free quote to discuss your specific requirements. MOQ 50 pieces, 24-hour response.