How to Source Custom Activewear: Moisture-Wicking, Four-Way Stretch, and Seamless Knits

Activewear is the one category where the fabric is the product. A customer is not buying a t-shirt to wear; they are buying dry, stretch, cool, and grip. That means performance claims have to be built into the spec, and “cotton blend” is disqualifying. This guide covers the performance fiber and finish options, the knitting technologies that produce them, and how to specify a garment that performs as advertised.

Why activewear is a different sourcing discipline

The practical consequence: you cannot approve an activewear sample by looking at it and holding it. You need to test it — wet it, stretch it, wash it 20 times, and see if the performance survives. That changes the approval process, the cost, and the timeline.

Performance fibers

Polyester

• The workhorse of activewear. 100% or high-poly blends
• Wicks moisture off the skin and dries extremely fast, typically 2-4x faster than cotton
• Excellent colorfastness, holds shape, does not absorb much water so it feels light
• Weakness: static cling, can feel plasticky, lower breathability in a non-mesh construction
• Best for: running, training, team uniforms, everything

Polyamide (nylon)

• Superior abrasion resistance, very strong, better hand feel than polyester
• Wicks and dries quickly, good color depth
• Used where durability matters: trail running, climbing, multi-use shorts
• 20-40% more expensive than polyester

Elastane (spandex / Lycra)

• The stretch fiber. Added to everything for 4-way stretch and recovery
• Content matters: 2-3% is standard for comfort stretch, 5-8% for compression, 10-12% for true compression garments
• Higher elastane means better stretch and recovery but lower abrasion resistance and a slightly different hand feel
• Elastane is not UV-stable over long periods, which matters for dark colors in hot climates

Lyocell (Tencel)

• Cellulosic, closed-loop solvent recovery, very good moisture management
• Cool to the touch, smooth drape, and it absorbs moisture rather than wicking it
• Better for low-intensity, lifestyle, and athleisure than for high-sweat training
• 20-50% more expensive than polyester

Cotton and cotton blends

• Not for high-performance use. Cotton absorbs sweat, dries slowly, and stays wet. It is heavy when wet and has no wicking
• Valid only for low-intensity apparel, loungewear, and very light training where breathability matters more than drying
• If a customer asks for a “cotton workout tee”, understand that they are choosing comfort over performance, and set that expectation explicitly

Blends worth knowing

Moisture wicking: what the test actually measures

How wicking works

Two different mechanisms, and they are not the same thing:

• Capillary wicking: a fabric with a channel structure (like a cross-section with grooves) pulls liquid along the surface. This is engineered into the yarn and the knit structure
• Absorption: the fabric takes liquid into the fiber. Cotton does this well, which is why cotton feels wet and heavy

True performance wicking means liquid moves along the surface and evaporates, rather than soaking in. Polyester does this because it has low absorbency and a capillary structure when spun as a hollow or micro-fiber yarn.

Wicking test methods

• Vertical wick test: a fabric strip is suspended and the base is immersed in water. Measure how far the liquid climbs in 30 seconds. Higher is better
• Horizontal wicking (bleed) test: a drop of water is placed on the fabric and the spread is measured
• Gravimetric absorption: the fabric is weighed dry, then wet, to measure the absorption rate

You do not need to run these yourself, but you do need to ask for the results, because “moisture-wicking” on a spec sheet without a number means nothing. Ask for the test method and the value.

Quick dry time

Compare against cotton. Polyester typically dries in 20-30 minutes in air; 100% cotton takes 2-4 hours for a t-shirt. When you ask a factory for a “quick dry” claim, ask them to state the tested dry time or at least the fabric’s absorbency rate, because a heavy 300 gsm polyester dries much slower than a 130 gsm mesh.

Stretch and recovery

Types of stretch

Recovery is the real performance metric

A fabric that stretches 40% and returns to 100% of its original length is good. A fabric that stretches 40% and stays 10% longer after 20 washes is a failure, and the garment will look baggy and fit differently than it did when you approved the sample. Recovery is not the same as elongation, and it is what determines whether the garment still fits after a season.

• Polyester with 5-8% elastane: good recovery, holds shape through many washes
• 100% poly without elastane: low stretch but excellent shape retention
• Lyocell blends: excellent recovery and drape, slightly less stretch
• Ask for the recovery test: stretch the sample 20% and release, repeat 5 times, and measure the residual

Specify the elongation, not just “stretchy”

The spec should state a minimum elongation percentage (commonly 30% for 4-way stretch) so the factory is quoting a real number. “Stretchy” is not a spec.

Knitting technologies

This is where activewear diverges most from basic apparel. The construction method determines the performance, the price, and the MOQ.

Single jersey

• The standard, cheapest construction
• Works for tights and basic training tops in a poly-elastane blend
• Least comfortable against skin over long wear, because of the seam and the density

Interlock

• Two layers knitted together, smooth and opaque
• Better for base layers and layering pieces
• Does not curl

Mesh

• Open structure with visible holes
• The best wicking fabric there is, because air moves through it
• Used for linings, ventilation panels, sports jerseys, and the body of many performance tees
• 140-220 gsm typical

Rib knit

• Vertical ribs, high stretch
• Used for cuffs, waistbands, and side panels where stretch is needed
• 1×1, 2×2, 3×3, 4×4, 6×6 constructions available

Double-knit / interlock with spandex

• Stable, opaque, high recovery
• The standard for yoga and sculpting leggings

Brushed fleece and brushed-back jersey

• Warm, softer, for cold-weather training and recovery wear
• Less wicking (the brushed surface traps moisture), better for mid-layer

Seamless knitting

The most significant technical difference in activewear. Instead of cutting panels and sewing them together, the whole garment is knitted in one piece on a circular or flat-knitting machine:

• No side seams — no chafing, a smoother silhouette, and no side seam line on the body
• Engineered zonal knitting: different yarn and structure in different zones — mesh at the back for ventilation, denser at the front for opacity, rib at the hem
• Bonded hems: the hem is knitted in and bonded, so there is no stitch and no chafing
• Custom patterns: a seamless machine can be programmed with a specific body map, which is what lets a factory make a compression garment that applies pressure where it should

The trade-off: seamless machines are expensive, setup is 1-2 weeks, MOQ is typically 500-1,000 pieces per style, and each new pattern requires programming. A seamless legging might cost 8-14 USD FOB against 5-7 USD for a sewn equivalent.

Bonded seams

• Seams are heat-bonded with film rather than stitched
• Completely flat and invisible, no thread, no perforation
• Used on premium seamless and compression garments
• Bonded seams cannot be repaired if they fail, so quality control on the bonding step is critical

Laser cutting

• Perforation patterns cut by laser rather than knit or printed
• Used for ventilation zones and design detail
• No stitching, edges are sealed

Finish technologies

Moisture-wicking finish

Applied to the fabric after knitting, it enhances the capillary action. Cheaper than engineering it into the yarn but it washes out over time. Ask how many washes the finish is rated for.

Antimicrobial and odor-control finish

• Silver, zinc pyrithione, or quaternary ammonium based
• Controls the bacteria that cause odor
• Effective for 20-50 washes typically, and must be re-applied or the garment needs replacing
• Regulatory: some finishes are restricted in the EU (treated articles regulations), and the treated article must be labeled
• 0.10-0.30 USD per garment

UV protection (UPF)

• UPF 50+ means less than 2% of UV transmission
• Achieved through tight weave, yarn denier, or a chemical finish
• For sun-protection apparel sold in the US and EU, the UPF rating must be tested and labeled (ASTM D6603 for the US)
• Add 0.20-0.50 USD for a tested UPF finish

Cooling and cooling-touch finishes

• Cooling touch: a finish that makes the fabric feel cool on contact, with a Q-Max value. Usually a phase-change or moisture-management finish
• Cooling: dissipates heat through evaporation. Best in dry climates, less effective in high humidity
• 0.25-0.60 USD per garment, and the effect degrades with washing

Branding and trims for activewear

• Reflective elements: for running and cycling, 0.15-0.50 USD per element, and safety-rated reflectivity must be tested
• Silicone gripper hems and waistbands: internal silicone strips that keep the garment from riding up. 0.20-0.50 USD per garment. This is a small detail that customers notice immediately
• Flatlock seams: the standard for activewear stitching. Flat, no bulk, reduces chafing. Specify it, and specify the thread
• Bonded seams: on seamless garments

Fit and sizing for activewear

Compression grading

Activewear sizing is not the same as a t-shirt. Compression garments use a graduated compression profile:

• Higher compression at the calf and thigh, lower at the waist
• Measured in mmHg (millimeters of mercury). 15-20 mmHg is moderate compression, 20-30 mmHg is firm, 30+ is medical-grade
• A graduated compression garment needs a specific body map, which means a custom pattern and a higher setup

Fit types

Sizing risks specific to activewear

• Compression sizing is counterintuitive: a bigger size can feel tighter because of the compression profile. Sizing charts must state the compression level, not just the measurement
• No size chart means guaranteed returns: activewear buyers already know their compression size, and “size M” on a compression legging is meaningless. State waist and hip in cm
• Waist and hip are both needed: unlike a t-shirt, a legging or short needs waist, hip, thigh, and inseam. Specify all four
• Men’s and women’s are not just scaled: women’s leggings have a higher rise and a larger hip-to-waist difference. Specify which chart

Size run for a first activewear order

• XS through XL, with the first-run allocation typically S 22%, M 32%, L 28%, XL 14%, XS 4%
• Compression and tights skew larger than expected, because a customer who is between sizes usually sizes up in compression

Full spec and grading details are in our sizing and grading guide.

Cost breakdown

Realistic FOB cost for a 500-piece order of seamless-style fitted performance tees, 140 gsm 88/12 poly/elastane mesh-textured knit, flatlock seams, silicone gripper hem, screen print chest logo, 2 colors across the run:

What moves the cost on activewear

• Elastane content: 2% to 12% is 0.60-1.50 USD per garment, and it changes the knitting difficulty
• Seam construction: a flatlock seam versus a standard lockstitch is 0.40-0.90 USD in labor
• Seamless versus sewn: 3-6 USD per garment, driven by the machine setup amortized over the run
• Special finishes: antimicrobial 0.10-0.30, UPF 0.20-0.50, cooling 0.25-0.60
• Reflective elements: 0.15-0.50 per element
• Heat transfer labels: 0.20-0.35 versus 0.05-0.10 for a woven label, but they are flat and do not irritate

MOQ and lead time for activewear

Stage-by-stage timing is in our lead times guide, and the MOQ logic behind custom fabric minimums is in our MOQ guide.

8 mistakes that cost activewear buyers money

1. Approving a performance garment by looking at it — you cannot tell wicking, stretch, and recovery from a photo or a hand-feel. Test it: wet it, stretch it, wash it 20 times
2. No performance numbers in the spec — “moisture-wicking” with no test method and no value is a marketing claim, not a spec. Ask for the wicking test result and the stretch elongation percentage
3. Using cotton in a performance product — cotton absorbs sweat, dries slowly, and stays heavy and cold. It is the wrong fiber for the use case
4. Forgetting the silicone gripper — a 0.30 USD detail that prevents the garment from riding up. Customers notice it immediately and it drives reviews
5. Not specifying flatlock seams — standard lockstitch seams chafe under sweat and movement. Flatlock is the activewear standard
6. Skipping the size chart for compression — a customer cannot buy a compression legging from “size M”. Give waist, hip, thigh, and inseam in cm
7. Under-ordering a seamless program — the setup cost is significant and spread over the run. A 300-piece seamless run costs far more per unit than a 1,000-piece run, and the machine capacity is the constraint
8. Forgetting that finishes wash out — antimicrobial and cooling finishes last 20-50 washes. If your customer washes weekly, the garment behaves differently by month three. Disclose it

Quality checks specific to activewear

Add these to the inspection brief, because generic garment inspections miss all of them:

• Wicking test: wet the fabric, confirm liquid moves along the surface and does not soak in
• Stretch and recovery: stretch to 30% and release, check it returns. Repeat after a wash
• Seam integrity: flatlock seams flat with no puckering or thread breaks, no gaps at the join
• Bonded seams (if specified): no lifting, no bubbling, the bond is continuous along the full seam
• Silicone gripper: present, evenly applied, not peeling, positioned per spec
• Print on stretch fabric: no cracking at the seam or fold lines after a stretch test
• Reflective elements: present, correctly positioned, not cracked or scuffed
• Labels: heat-transfer labels flat and bonded, not lifting at the edges
• Color match: body, panels, and trims read as one color under daylight, and the color is consistent across the batch

How to structure the inspection request is covered in our QC and AQL guide.

Packaging for activewear

• Flat fold, folded in thirds. Do not use compression or vacuum bags: they crush the knit structure and the silicone gripper
• Individual poly bags, 0.05 mm, perforated
• Typical unit load: 40-60 pieces per master carton
• A 20ft container holds roughly 18,000-24,000 performance tees; a 40ft high cube holds 40,000-55,000

Carton and container math is in our packaging and container optimization guide.

FAQ

What fabric is best for activewear?

Polyester for performance. Polyester with 5-8% elastane for fitted pieces that need stretch and recovery. Polyamide where abrasion resistance matters. Lyocell blends for athleisure where comfort and drape matter more than drying speed. Cotton only for low-intensity apparel where the wearer will not sweat heavily.

How do I know a garment actually performs?

Test it yourself before bulk: wet the fabric and see if liquid spreads along the surface rather than soaking in, stretch it 30% and release to check recovery, and wash it 20 times to see whether the performance survives. For claims you intend to make on the product page, ask the factory for a lab test result with the method and the value stated.

What is seamless knitting and is it worth the cost?

Seamless knitting produces the whole garment in one piece, with no side seams and with different structures engineered into different zones. It is genuinely better for comfort and it is the reason premium performance garments cost what they do. It is worth it when the brand is selling performance as a feature. It is not worth it when the brand is selling style. The cost premium is 3-6 USD per garment and the MOQ is 500-1,000 pieces per style.

What is a silicone gripper and do I need it?

It is an internal silicone strip at the hem or waistband that grips the skin and stops the garment riding up. It costs 0.20-0.50 USD per garment and it is one of the highest-perception-impact details in activewear. Yes, you need it. Reviews about a garment riding up are far more damaging than reviews about a missing 0.30 USD detail.

How much should custom activewear cost?

FOB from China: a 500-piece run of a flatlock performance tee in 88/12 poly-elastane with a silicone hem and a chest print lands around 6.50-9.00 USD per piece. A seamless compression legging lands 8-14 USD. A bonded-seam seamless top lands 12-20 USD. For the general cost model, see our pricing guide.

What is the minimum order for custom activewear?

200-300 pieces per style per color for a cut-and-sew garment. 500-1,000 for seamless, and 1,000+ for a graduated compression garment with a custom pattern. The machine and setup costs, not the fabric, drive these numbers.

Do antimicrobial finishes actually work?

They work for 20-50 washes, which is roughly one to two months of regular wear. After that the odor control degrades even though the garment still looks fine. If the antibacterial benefit is a selling point, disclose the wash count, and consider recommending a re-wash treatment or a garment rotation. Regulatory note: in the EU, treated articles must be labeled and the treatment must comply with the treated-articles rules.

How do I handle sizing for compression garments?

Publish waist, hip, thigh, and inseam in centimeters on the product page, and state the compression level in mmHg. Also publish a “how to choose” guide explaining that a customer between sizes should size up in compression. Many brands do not include this and lose the sale, or lose the customer to a return. See our returns and inventory guide for what fit returns cost.

Should I use heat transfer labels instead of woven labels?

For activewear, yes, usually. A woven label on a smooth performance knit sits proud, rolls at the edges, and irritates the skin over long wear. A heat transfer label or a printed transfer is flat. The cost is 0.15-0.25 USD more per garment, which is a good trade for the comfort and the appearance. Specify the placement on the inside of the back neck.

How this fits the buyer journey

Everything in the general cluster applies. These are the ones that matter most for activewear:

• Custom Fabric Development — GSM, fiber composition, stretch content, recovery
• Sizing and Grading — compression grading and multi-measurement sizing
• Decoration Methods — print and transfer on stretch fabrics
• Color and Dye Development — matching body, panels, and trims
• Custom Apparel Pricing — what moves the cost per piece
• MOQ Guide — why seamless MOQ is higher
• Lead Times — seamless timelines run longer
• QC and AQL — the performance-specific inspection checks
• Packaging — no compression bags
• Hoodies and Sweatshirts — knitwear sourcing
• T-Shirts — the base layer
• Denim — woven construction
• The 5-Step Process — the full workflow

How we work at Kemondo

At Kemondo Apparel, activewear is where we can add the most value beyond manufacturing, because performance is a specification discipline rather than a production discipline. Our stock performance library covers 120-260 gsm in poly, poly-elastane at 2% through 12%, and lyocell blends, in single jersey, interlock, mesh, and rib, which keeps a cut-and-sew first order at 200-300 pieces per style. Every performance quote specifies the fiber composition, the elastane percentage, the stretch type with a minimum elongation, the seam construction, the label type, and the finishes with their wash durability. We do not approve a performance sample on appearance alone: the sample is wet-tested, stretch-tested, and wash-tested, and we report the results. We run flatlock on all performance sewing as standard, and we specify silicone gripper hems on fitted pieces. For seamless programs we work with two partner machines and handle the pattern programming, with MOQ and timeline stated honestly up front. And we are direct about the one thing that matters: if a product is going to be sold on a performance claim, the claim should be a tested number in the spec, not a word in the marketing.

Planning an activewear program and want a real quote? Message us on WhatsApp with the product type, the performance you need to hit, your quantity, and your target market. We usually reply within 12 hours with a full cost breakdown, the fabric and construction options, and an honest read on what is achievable.