Materials
Fabric GSM: Choosing Weight by Product and Use
GSM is useful, but weight alone does not determine warmth, opacity, recovery, durability, or perceived quality.
What does fabric GSM tell you?
GSM means grams per square metre. It is a consistent way to compare fabric mass, but it is not a complete quality score. Two fabrics with the same GSM can behave very differently because of fibre content, yarn size, knit or weave structure, finishing, and compactness.
How should a target GSM be selected?
Choose a target range from the desired performance, climate, silhouette, and price position rather than selecting a number in isolation.
- Lightweight tops prioritize breathability and drape but may require opacity testing.
- Structured T-shirts need enough body to hold shape without feeling rigid.
- Fleece products balance surface appearance, brushed-back warmth, shrinkage and pilling resistance.
- Performance knits require recovery, stretch consistency, moisture management, and seam compatibility.
Review fabric weight in product context
This table organizes buyer considerations without setting universal GSM ranges or S & H Global production standards.
| Product context | Possible structure | Weight consideration | Buyer checks |
|---|---|---|---|
| Structured T-shirt | Cotton or cotton-rich jersey | Enough body for the intended shape without unwanted stiffness | Opacity, shrinkage, neck recovery, print surface and wash appearance |
| Tracksuit | Brushed fleece or loopback terry | Balance warmth, drape and the intended season or use | Fabric feel, shrinkage, rib recovery, surface appearance and set consistency |
| Performance top | Performance interlock or another suitable knit | Consider stretch and coverage together with mass | Opacity, stretch, recovery, movement, seams and wash performance |
| Leather outerwear | Leather with lining and hardware | Use leather thickness and construction rather than GSM alone | Feel, finish, panel appearance, lining and hardware compatibility |
What evidence should support a material claim?
Words such as premium, heavy, soft or performance are subjective. Ask for measurable composition and weight, then evaluate a physical fabric cutting or sample. Where relevant, confirm shrinkage, colorfastness or how well color holds, pilling or small fibre balls, stretch recovery, twisting after washing (spirality), abrasion and wash appearance against the intended care method.
What should the approved fabric standard record?
Record the approved fabric supplier, construction, composition, weight tolerance, color standard, finish, and test expectations. Bulk material should be assessed against this agreed standard rather than memory of the sample.
Before approving a fabric standard
- Record composition and construction
- State the target weight and permitted variation
- Identify the approved color and finish
- Confirm the required physical sample or cutting
- Record relevant product-specific test expectations
Related resources
Continue planning
- Compare fabrics and leather Review fleece, jersey, performance knit, technical woven and leather options in the material library.
- Explore tracksuit material options See how brushed fleece and loopback terry can be used for different tracksuit styles.
- Review T-shirt fabric development Compare heavyweight cotton jersey and performance interlock for different T-shirts.
- See performance sportswear materials Review the knit and stretch-woven fabrics used in our sportswear examples.
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