GSM means grams per square meter. In fabric sourcing, it tells buyers how much one square meter of fabric weighs, but it does not fully describe thickness, softness, stretch or quality.
For knitted fabrics, GSM is one of the most important quotation details. It helps the factory estimate yarn use, cost, handfeel direction and whether the fabric is suitable for the target garment.
What does GSM mean in fabric?
GSM is a fabric weight measurement. A higher GSM usually means more material per square meter, while a lower GSM usually means a lighter fabric.
However, GSM is not the same as thickness. Two knitted fabrics can have the same GSM but feel different because of yarn type, knitting structure, spandex content, finishing and compactness.
Why does GSM matter when asking for a quotation?
GSM affects yarn consumption, dyeing cost, finishing behavior, packing weight and final garment performance. If a buyer requests a price without GSM, the factory can only give a rough estimate.
A clear GSM range helps avoid unnecessary sample rounds. For example, a buyer can say “polyester spandex mesh, 120-140 GSM” instead of only saying “stretch mesh fabric.”
How does GSM affect knitted fabric performance?
| GSM Factor | Possible Effect | Buyer Should Check |
|---|---|---|
| Lower GSM | Lighter weight, better drape, possibly more transparency | Opacity, seam strength and durability |
| Higher GSM | More coverage, stronger handfeel, higher material cost | Breathability, bulk, drying speed and price |
| Same GSM, different structure | Different stretch, thickness and surface feel | Reference sample and physical testing |
| GSM after finishing | Can change after dyeing, setting or coating | Final approved sample, not only greige fabric |
Is higher GSM always better?
Higher GSM is not always better. A heavy sportswear fabric may feel too warm, dry slowly or reduce movement. A heavy underwear fabric may lose softness. A heavy mesh may reduce airflow.
The correct GSM depends on the application. Sportswear panels, swimwear, underwear, bridal mesh, bag fabric and industrial textile materials all need different balances of weight, strength, opacity and handfeel.
What GSM range should buyers provide?
If the buyer already has a target sample, the best method is to measure the sample GSM and send it to the factory. If the buyer does not have a sample, a range is acceptable.
For example, a sourcing request can use “100-120 GSM” or “around 160 GSM” instead of an exact number at the first stage. The factory can then recommend a practical construction based on the end use.
Why can two fabrics with the same GSM feel different?
Fabric feel is shaped by more than weight. Yarn count, filament type, knitting density, elastane ratio, heat setting, brushing, softening and finishing all affect the final handfeel.
This is why buyers should not approve fabric only from GSM data. They should compare the physical sample, garment use and test results before confirming bulk production.
Factory sourcing checklist
- Provide target GSM or an acceptable GSM range.
- Send composition, width, color, stretch direction and handfeel requirement.
- Explain the final application: sportswear, underwear, swimwear, lining, bridal, bag or industrial use.
- Share a reference sample or photo if the fabric appearance matters.
- Ask whether the quoted GSM is before or after dyeing and finishing.
- Confirm tolerance for GSM, width, shrinkage and shade before bulk production.
FAQ
Does GSM measure fabric thickness?
No. GSM measures weight per square meter. Thickness can be related to GSM, but structure and yarn also affect thickness.
Can knitted fabric GSM be customized?
Yes. A factory can adjust yarn, knitting density, structure and finishing to approach the required GSM range.
Why does fabric GSM change after finishing?
Dyeing, heat setting, softening, coating and other finishing steps can change fabric width, shrinkage and final weight.
What happens if buyers do not provide GSM?
The quotation may be inaccurate because yarn consumption and production route are unclear. A sample or GSM range makes pricing more reliable.
Should buyers approve GSM or handfeel first?
Both should be checked together. GSM gives technical direction, while handfeel confirms whether the fabric is suitable for the garment.
Changle Textile develops custom knitted fabric categories including mesh, tricot, jersey, interlock, sportswear, swimwear and underwear fabrics. Use the fabric inquiry form to send GSM, composition and application requirements.
FABRIC COST & GSM HUB
Connect GSM, usable width, shrinkage and real fabric cost
Use these guides to compare fabric weight, width, testing and consumption before evaluating supplier quotations.