GSM is the single most important number in clothing that no one talks about. It’s printed on almost nothing. It’s mentioned in almost no product descriptions. And yet it tells you more about how a garment will feel, wear, and last than any brand name, colourway, or marketing claim ever could.
Here’s what it means, how to read it, and why it should be the first thing you look for.
What Is GSM?
GSM stands for grams per square metre. It’s the standard measurement of fabric weight — how much a one-metre-square piece of that fabric weighs in grams. The higher the number, the heavier and denser the fabric. The lower the number, the lighter and more open the weave or knit.
That’s it. Simple in principle. But the implications run deep.
The GSM Spectrum
100–150 GSM — Lightweight
Thin, breathable, and often semi-transparent. Fine for summer basics or layering pieces. Prone to pilling, distortion, and wear over time. You’ll feel the difference after a few washes.
150–220 GSM — Mid-Weight
The standard range for most high-street tees and basics. Acceptable quality, reasonable durability. This is where most brands live because it’s cheap to produce. Not where we want to be.
220–300 GSM — Heavyweight
Substantial hand-feel. Holds its shape. Drapes with intention. This is where quality streetwear lives. A 280 GSM tee feels like a garment, not a disposable. It’s the minimum we consider for core pieces.
300+ GSM — Premium Heavyweight
Dense, structured, and built to last decades. The territory of serious hoodies, outerwear, and pieces designed to anchor a wardrobe. When you pick it up, you know immediately. This is what we build towards.
Why Does It Matter?
Fabric weight affects everything:
Durability. Heavier fabrics resist pilling, tearing, and distortion. A 320 GSM hoodie will outlast a 280 GSM version of the same garment — not by a little, but by years.
Shape retention. Lightweight fabrics stretch and sag. Heavyweight fabrics hold their silhouette wash after wash. If you’ve ever had a tee that looked great on day one and shapeless by month three, GSM is why.
Hand-feel. The tactile experience of a garment is almost entirely determined by its weight and construction. Cheap feels cheap. Heavy feels considered.
Perceived value. When someone picks up a heavyweight piece, they feel the quality before they see it. That first impression is built entirely on GSM.
Why Brands Don’t Tell You
Most brands don’t publish GSM because it would make comparison too easy. If you knew that their £65 hoodie was 280 GSM and ours was 420 GSM, the conversation would be over before it started.
Opacity is a feature of fast fashion, not a bug. The less you know about what you’re buying, the easier it is to sell you something that won’t last.
The DØNE Standard
We publish GSM on every product because we think you should know what you’re buying. We select fabrics based on weight first, then construction, then colourway. If a fabric doesn’t meet our minimum threshold for the garment type, it doesn’t make it into the collection.
That’s not a marketing position. It’s just how we think clothes should be made.
Next time you’re buying a tee, a hoodie, or any basic — ask about the GSM. If the brand can’t tell you, that’s your answer.