What Does GSM Mean in Clothing? Fabric Weight Explained

GSM stands for grams per square metre. It tells you how heavy a fabric is, so a higher number means a heavier, thicker fabric and a lower number means a lighter one.

What does it actually measure?

Imagine a square of fabric one metre by one metre. GSM is how much that square weighs in grams. It is a simple way to compare fabrics on the same scale, whether you are looking at a tee, a hoodie or a jumper.

Is higher GSM always better?

No. Heavier is not automatically better, it is just different. A heavier fabric feels warmer and more structured, and a lighter one feels airy and drapes more. The right choice depends on what you want to wear it for and when.

How can I use it when shopping?

Think of GSM as a guide to feel and season:

• Lower numbers suit warm weather, layering and a relaxed drape
• Middle numbers are a flexible everyday choice
• Higher numbers feel substantial, warmer and hold their shape

There are no strict rules, so treat it as a hint and not a promise.

Does GSM tell me everything?

It does not. Two fabrics with the same GSM can feel very different, because the fibres, the knit and the finish all play a part. A tightly made fabric can feel better than a loose one of the same weight. If you can, feel it in person or check the product description and reviews.

Where will I see GSM?

Mostly on tees, hoodies and sweatshirts, and often on blank garments that brands print on. It is worth looking for whenever you are comparing two similar pieces side by side. Some brands list it and some do not. We are not going to quote numbers for our own pieces here, so check each product page for what is listed.

How does it connect to the rest of the guide?

Fabric weight sits alongside other things like cotton type and construction. If you want the bigger picture on thick cotton, read the heavyweight cotton hoodie guide. If you are comparing hoodie fabrics, see French terry vs fleece. And for the wider checklist, there is how to tell if a hoodie is good quality.

Armed with the numbers, shopping gets easier. Have a look around the shop and see what feels right.

MORE LUV.