What a Sportswear Manufacturer Actually Makes
Sportswear covers a wide range, from a plain team t-shirt to a seamless compression legging. What links the category is function: the garment has to move with the body, manage sweat, dry in a sensible time and keep its shape and colour after many washes. A sportswear manufacturer therefore needs more than a sewing line. It needs access to engineered fabrics, the right machines for stretch seams, and a testing routine that checks performance rather than appearance alone.
Activewear is a close cousin. The term usually describes athletic-looking clothing that is worn for training and for everyday life: leggings, sports bras, performance tees, shorts, track jackets and layers. Some activewear is lightly technical and some is highly engineered. The difference matters because the sourcing route, the fabrics and the tests change as the performance claims get stronger.
Before you contact any factory, decide whether you need technical performance or sports-inspired styling. A cotton-rich fleece jogger and a moisture-wicking running tight are both sold as sportswear, but they are made from different fabrics, on different machines, by different specialists.
Sportswear, Activewear and Athleisure: Where the Line Sits
Brands use these three words loosely, and the difference changes who you should approach. Sportswear usually means garments designed for a sport or training, where performance is the selling point. Activewear is a broader term for clothing that looks athletic and can be used for training. Athleisure describes sports-inspired clothing designed mainly for everyday wear, such as sweatshirts, joggers and relaxed leggings in comfortable fabrics.
Athleisure often needs no special performance engineering, so a general garment factory with good knit experience can make it. Genuine performance products need a specialist. A useful test is to write down the claims you intend to put on the hang tag or website. If they include wicking, support, compression, quick drying or temperature regulation, you are sourcing technical product and should treat the factory search accordingly.
The more specific the performance claim, the more specific the evidence you should ask for. A claim you cannot support with a test report is a risk to your brand, however good the fabric feels.
Performance Fabrics Used by a Sportswear Manufacturer
Most performance garments are built from synthetic fibres, mainly polyester and nylon, often with a small amount of elastane for stretch. Synthetic fibres absorb very little water, which is the basis of moisture management; our guide to cotton vs polyester explains the moisture regain figures behind it. The table lists the fabric families you are most likely to meet.
Common sportswear fabrics and their typical use
| Fabric | Composition | Handfeel and character | Typical use |
|---|---|---|---|
| Polyester jersey | Polyester, sometimes with a wicking finish or engineered yarn | Light, smooth, quick drying | Training tees, team shirts, base layers |
| Polyester-elastane | Polyester with a small proportion of elastane | Stretches and recovers well, supportive | Leggings, shorts, fitted tops |
| Nylon-elastane | Nylon with elastane | Smooth, soft and strong; often a premium feel | Leggings, sports bras, seamless garments |
| Mesh and eyelet knits | Polyester, open construction | Very breathable and light | Panels, linings, ventilation zones, football-style shirts |
| Brushed interlock | Polyester or blends, brushed on one side | Soft, warmer, slightly heavier | Cold-weather training tops, mid layers |
| Fleece and French terry | Cotton-rich or polyester, loop-back structure | Warm and comfortable, less technical | Joggers, hoodies, warm-up wear |
General fabric families. Exact composition, yarn and finish vary by mill and by product.
Ask any sportswear manufacturer for a swatch and a technical data sheet before you decide. Weight, composition, finish and stretch percentage should be stated, not described in adjectives.
Indicative Fabric Performance Ratings
The matrix below compares the main performance fabrics on the properties buyers care about most. It is a rough guide to help you shortlist, not a substitute for testing a real sample.
Sportswear fabrics compared
1 dot = low, 5 dots = high
| Polyester jersey | Poly-elastane | Nylon-elastane | Brushed interlock | |
|---|---|---|---|---|
| Stretch and recovery | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Moisture wicking | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Softness against skin | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Warmth | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Pilling resistance | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Opacity when stretched | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
Indicative ratings based on typical fabric/process characteristics, not laboratory results.
Opacity is worth noting for leggings. A fabric that looks fine on the hanger can become see-through when stretched over the body, so squat-test your samples, which means wearing them in a deep squat and checking in good light.
Construction: Seams, Stitches and Finishing
Seam construction affects comfort and durability as much as fabric does. In stretch garments the stitch must stretch with the fabric, and in garments worn close to the skin it should lie flat to avoid rubbing. Choosing the wrong stitch is a classic reason a prototype looks good but feels poor in use.
Seam and stitch types in activewear
| Method | How it works | Why use it | Trade-off |
|---|---|---|---|
| Flatlock seam | Two fabric edges are butted and stitched flat with a cover-stitch style machine | Flat, low-bulk seam; common in activewear | Needs the right machine and a skilled operator |
| Cover-stitch hem | Two or more parallel needle lines with a looper stitch underneath | Stretchy, neat hem and neckline finish | Uses more thread and takes careful tension setting |
| Overlock (serged) seam | Stitches and trims the edge in one pass | Fast, economical, flexible | Slightly bulkier than flatlock against the skin |
| Bonded or taped seam | Seam is glued or taped rather than stitched | Smooth, can reduce bulk; used in some premium or weather-ready garments | Specialist equipment and process; less common for small brands |
| Seamless knitting | Garment is knitted nearly complete on a circular machine | Few seams and a body-mapped feel | Specialist machinery and usually higher minimums |
Descriptions of standard methods. Availability depends on the factory and its machinery.
Labels matter too. A scratchy woven neck label is a common complaint in activewear, so many brands choose heat-transfer labels or soft printed labels. See our guide to custom clothing labels for the options.
Typical Fabric Weights in Activewear
Fabric weight is measured in grams per square metre, or GSM. Lighter fabrics are cooler and quicker drying; heavier ones feel more substantial and are more opaque. The ranges below are typical for the category and vary by product and mill, so use them to frame a conversation rather than to specify a garment.
Typical GSM by sportswear product
Grams per square metre
Typical ranges, which vary by product, yarn and factory. Confirm the target GSM and tolerance with your supplier.
Our fabric GSM guide explains how weight is measured and what tolerance to expect.
Testing: What to Check Before You Approve Bulk
Performance claims need evidence. Because the garment is meant to work under sweat, stretch and repeated washing, the tests go beyond shrinkage and look at how the fabric behaves. Ask your sportswear manufacturer which tests they run in-house and which they send to an external laboratory, and request the reports for your fabric.
Tests worth asking for
| Test | What it tells you | Notes |
|---|---|---|
| Moisture wicking or absorbency | How quickly the fabric moves or absorbs moisture | Specify the test method with the laboratory; several exist |
| Stretch and recovery | Whether the fabric returns to shape after stretching | Important for leggings, bras and fitted tops |
| Colour fastness to perspiration | Whether sweat causes colour to bleed or change | ISO 105-E04 is the standard method name |
| Colour fastness to washing and rubbing | Whether colours survive laundering and friction | Vital on dark colours and prints |
| Dimensional stability | How much the garment shrinks or distorts after washing | Check length and width separately |
| Pilling | Surface bobbling after abrasion | More noticeable on brushed and staple-based fabrics |
| Opacity and squat test | Whether the fabric becomes see-through under stretch | A practical wear test in good light |
Test names and methods are standard references; ask the laboratory which version applies to your market.
Our guide to garment testing covers shrinkage, colour fastness and pilling in more detail, and the AQL inspection guide explains checks on the bulk order itself.
Printing and Decoration on Performance Fabrics
Decoration choices narrow quickly on synthetic fabric. Polyester does not take water-based ink in the same way as cotton, and heavy plastisol prints can stiffen stretch fabric. Many sportswear brands therefore use dye sublimation for all-over and team designs, because it colours the fibre itself and leaves the handfeel and stretch intact. It works best on white or light polyester, and we explain the limits in our sublimation printing guide.
Other options include heat-transfer film, silicone grip prints for waistbands and cuffs, and embroidery for badges on thicker pieces. Each adds weight and stiffness in different ways, so ask for a wash and stretch test of the decoration as well as the fabric.
Team Kits, Leggings and Sports Bras: Different Sourcing Needs
Product type changes the route. Team kits are often sublimated cut-and-sew garments with many size and name variations. Leggings and sports bras depend on stretch fabric engineering, pattern accuracy and seam comfort, and sports bras can involve elastics, padding and support requirements that need specialist knowledge. Performance outerwear adds waterproofing, taped seams and zips.
If your first product is technical, expect a longer development period with more fit samples and tests. Start with a smaller range of styles so you can learn the fabric and fit behaviour before adding complexity. Our guide to custom clothing production sets out the general sequence from brief to bulk.
How to Develop a Sportswear Range, Step by Step
Technical garments need a longer and more test-driven path than casual basics. The sequence below shows the order in which decisions are normally made, and it is worth agreeing it with your factory before the first sample is cut.
From brief to approved bulk
- 1Define the performance briefSport, climate, fit and the claims you want to make.
- 2Choose fabric and swatchRequest composition, GSM, stretch and finish data with physical swatches.
- 3Build the tech packInclude seam types, stitch details, trims, label placement and measurements.
- 4Prototype and fit testTest fit while moving, not only standing still.
- 5Test fabric and garmentRun wicking, stretch, fastness and shrinkage checks on a proper sample.
- 6Pre-production and bulkApprove a final sample, then inspect the bulk against it.
General development path. Technical garments may need several fit and test rounds.
The tech pack is the document that holds all of this together. Our tech pack guide explains what it should contain.
How to Choose a Sportswear Manufacturer
Look for evidence of experience in the same type of product you want to make. A factory that makes leggings every day will know the stitch settings and pattern adjustments that a general factory is still learning. Ask for samples of similar garments, details of the machines and test routines, and references you can contact. The questions in our manufacturer vetting checklist apply here as well.
Questions for a sportswear manufacturer
- Which performance fabrics do you source regularly, and can you share data sheets?
- Do you have flatlock and cover-stitch machines, and operators who use them daily?
- What do you test in-house, and which tests go to an external laboratory?
- Can you show comparable garments you have already made?
- How do you manage fit samples for stretch garments?
- What decoration methods do you offer for synthetic fabric?
- How do you control shade matching between dye lots?
What Ruhrose Does and Does Not Do in Sportswear
Technical performance sportswear is outside Ruhrose's core. We develop and produce hoodies, jersey garments such as t-shirts, polos and joggers or fleece, denim and woven casualwear, with production in Bangladesh and UK buyer support. That means a fleece jogger, a cotton-rich sweatshirt or a jersey training tee in a standard fabric can sit comfortably within our range, but engineered wicking leggings, sports bras, compression garments, seamless knitting and performance outerwear do not. If your product is in that second group, you are better served by a specialist activewear factory with proven fabric sources and test capability. See our tracksuit and joggers manufacturer guide for the parts of this category we do cover.