GSM stands for grams per square metre. It is the weight of one square metre of a fabric, and it is the quickest honest measure of how substantial a garment is. A higher GSM means the cloth is denser and heavier, usually more durable and more structured. A lower GSM means it is lighter and more breathable.
What GSM actually measures
Take a single square metre of cloth, put it on a scale, and read the number in grams. That is GSM. It does not describe the fibre, the weave or the finish, but it tells you something the label rarely will: how much fabric is actually there. Two t-shirts can look identical on a hanger and feel like different garments entirely once you know one is 150 GSM and the other is 320.
It is worth saying that GSM is not the whole story. Fibre quality, knit and construction all matter. But weight is the part most brands quietly skip, and it is the part you can feel in your hands the moment you pick something up.
What the numbers feel like
Here is a rough orientation for cotton tops. Treat it as a guide rather than a rule, because weave and blend shift the feel.
- Around 150 GSM is lightweight summer tee territory. Thin, breathable, prone to clinging and showing what is underneath.
- Around 250 to 350 GSM is mid to heavy. This is where a top starts to hold its shape, drape properly and feel like it will outlast the season.
- 400 GSM and above is genuinely heavyweight. Dense, structured, the kind of cloth that stands on its own and softens beautifully with wear.
You can place our own pieces on that scale. The Born To Be A Star longsleeve sits around 240 GSM in ring-spun cotton with a touch of elastane, so it moves with you while still feeling like something. The tracksuit hoodie and joggers land at roughly 500 GSM cotton, firmly in heavyweight territory. And the Resurge Jeans run to about 420 GSM raw denim, which is why they break in the way good raw denim should. You can see the full range in the shop.
Why we build heavy
Phrase Studios started in Gent in 2023 with a simple idea, "from friends, to friends." Part of that is refusing to cut corners you cannot see. We build heavyweight, GSM-led pieces, and we literally weigh the cloth before we commit to it. There is a journal note called "Why we weigh the cotton" that goes deeper, but the short version is this: weight is where durability lives.
Heavier cloth resists stretching out at the collar and cuffs. It holds colour longer. It drapes with intent instead of hanging limp. A heavy hoodie feels like an object you own rather than something you replace every winter. You can read more about how we think about all of this on our studio page.
How to judge quality by weight
You do not need a scale to read a garment well. Pick it up and let the weight register in your hand first. Hold it to the light and see how much passes through. Pinch the fabric and feel whether it springs back or stays crushed. Check the seams and the cuffs, because heavy cloth deserves construction that can carry it.
If a brand publishes its GSM, that is usually a good sign. It means someone in the room cared enough to measure. When the number is missing, the weight in your hands will tell you most of what you need to know.
FAQ
Is higher GSM always better?
Not always. Higher GSM usually means more durable and structured, but a heavyweight tee in high summer can feel like too much, and a light layer has its place. The right GSM depends on what the garment is for. For everyday pieces you want to keep for years, heavier almost always wears better.
What is a good GSM for a hoodie?
A solid hoodie tends to start around 300 GSM, with genuinely heavyweight versions sitting at 350 to 400 and above. Our tracksuit hoodie runs at roughly 500 GSM cotton, which gives it the density and structure you want from a piece you reach for constantly.
Does heavier fabric last longer?
Generally yes, when the construction matches the cloth. Denser fabric resists thinning, bobbling and stretching at stress points like collars and cuffs, so it holds its shape and colour for longer. Weight is not the only factor, but it is one of the most reliable signals of how a garment will age.