GSM Explained: Choosing Fabric Weight for Team Wear and Activewear
GSM is the number on a spec sheet that tells you how heavy a fabric is. This guide explains what it measures, which ranges suit which garments, and how to put a weight in your brief so samples match your expectations.
- GSM is grams per square meter. It shows weight, not quality.
- Match weight to use: light for performance tops, mid-weight for tees and polos, heavy for fleece.
- Fiber, knit structure and finish change how a given GSM feels.
- Ask for a swatch and a stated tolerance, then approve a sample before bulk production.
What GSM Measures
GSM means grams per square meter. Cut a piece of fabric one meter by one meter, weigh it, and the result is its GSM. A 150 GSM jersey is lighter and thinner than a 300 GSM fleece.
US suppliers often quote ounces per square yard instead. To convert, divide GSM by 33.9, so 200 GSM is roughly 5.9 oz. When you compare quotes from different regions, check which unit each one uses.
GSM only describes weight. Two fabrics at 180 GSM can feel very different if one is combed cotton and the other is polyester, or if one is a tight single jersey and the other an open mesh. Treat GSM as one line of the spec, next to fiber content and knit type. Our sportswear fabric guide covers fibers and blends.
Typical GSM Ranges by Garment
The table below gives general industry ranges. Real products vary by supplier and knit, so use it as a starting point for your brief, not as a specification for any one product.
| Garment | Typical GSM | What it feels like |
|---|---|---|
| Performance jersey or singlet | 120 to 160 | Light, breathable, quick drying |
| T-shirt | 140 to 200 | Light to mid-weight, easy to print |
| Polo shirt (piqué) | 180 to 230 | Textured, holds its shape at the collar |
| Leggings and compression wear | 200 to 280 | Dense enough to stay opaque when stretched |
| French terry | 220 to 320 | Smooth outside, soft loops inside |
| Fleece hoodie or sweatshirt | 280 to 400 | Warm and substantial |
How to Choose a Weight
Start from the job the garment does, then work back to a number.
Sport and climate
Fast, hot sports such as soccer and running favor light fabric that moves moisture away. Cold-weather training and warm-ups favor heavier fleece.
Decoration method
Very thin fabric can show embroidery stabilizer or ripple around stitching. Sublimation works on polyester, and a very light polyester can look slightly translucent in white areas. Our guide to how sublimation printing works explains the fabric side of that choice.
Budget and freight
Heavier fabric uses more material and weighs more per carton, so both unit cost and shipping weight go up. See the custom sportswear manufacturing cost guide for what drives pricing.
Wear and washing
School and club kit is washed often. A slightly heavier, tighter knit usually holds its shape longer, but only if the fiber and finishing are good. Ask for a wash test on a sample.
Examples From the Range
These products show the garment types where weight decisions matter most. Their listings do not state a GSM, so the weight for your order is agreed with you in the quotation.
Custom Hoodie ART# MI-8603
Charcoal pullover with a front pouch pocket. A fleece weight question.
Custom Sweatshirt ART# MI-8805
Navy crewneck in a plain solid colour. Terry or fleece, your call.
Custom Gym T-Shirt ART# MI-9404
Navy marl short-sleeve tee with a round neckline. A light to mid-weight choice.
For a full look at hoodie construction and decoration, read our guide to custom hoodie manufacturers in Sialkot.
How to Put GSM in Your Brief
- Name the garment and useSay whether it is a match shirt, a training top or a winter layer.
- State a target rangeGive a range, such as 160 to 180 GSM, rather than a single number.
- Add a referenceSend a garment you like, or describe its feel, and ask for a matching swatch.
- Agree a toleranceFabric weight varies slightly between rolls, so write down what variation you accept.
- Record it in the tech packFabric weight belongs on the spec sheet. See what a sportswear tech pack includes.
Common GSM Mistakes
Comparing GSM across fabric types
A 200 GSM polyester mesh and a 200 GSM cotton jersey are not equivalent. Compare like with like.
Assuming heavy means premium
A heavy, coarse fabric can feel worse than a lighter, finer one. Judge the swatch by hand.
Ignoring the season
A winter-weight tee in a summer league kit gets complaints from players. Match weight to when it is worn.
No weight in the brief
If the weight is not written down, the sample may not match what you pictured.
Checklist Before You Approve a Sample
- Fabric weight stated and a tolerance agreed
- Fiber content written on the spec sheet
- Swatch handled and compared with your reference
- Decoration tested on the actual fabric
- Wash test result reviewed
Frequently Asked Questions
What does GSM mean on a fabric spec?
GSM stands for grams per square meter. It measures how much a square meter of fabric weighs, so a higher number means a heavier, denser cloth. It does not measure quality by itself.
How do I convert GSM to ounces per square yard?
Divide GSM by 33.9. A 200 GSM fabric is about 5.9 oz per square yard. US buyers often see weights listed in ounces, so ask for both numbers if you compare quotes across regions.
Is a higher GSM always better?
No. A heavy fabric suits a winter hoodie but is a poor choice for a running singlet or a soccer shirt. Pick the weight that fits the use, the season and the decoration method.
Can I ask for a specific GSM on a custom order?
Yes, you can state a target weight or send a reference garment in your brief. Minimum order, lead time and sample terms are confirmed in the quotation.
How can I check the GSM of a sample?
Ask the supplier for the fabric spec sheet, then confirm it by weighing a cut swatch of known area on a small scale. Weights can vary by a few percent, so agree an acceptable tolerance in writing.
Need Help Choosing Fabric Weight?
Send your garment types, target use and any reference sample. Maswiz Industries will review your brief and reply with the next steps.
