What 360gsm means when you are holding it
Most clothing is sold with adjectives. Soft, premium, heavyweight, buttery. None of them mean anything you can check, and two garments described identically can arrive feeling nothing alike.
There is one number that fixes this, and it is usually missing from the page. Grams per square metre.
What the number is
GSM is the weight of one square metre of the cloth. That is the whole definition. It is not a quality score, it is not a thread count, and it is not a rating anyone awards. It is a measurement, which is exactly what makes it useful: two mills measuring the same cloth get the same answer.
Because it measures the cloth rather than the garment, it is comparable across brands in a way almost nothing else on a product page is. A 220gsm jersey is a 220gsm jersey whoever cut it.
What the ranges feel like
Roughly, and with the caveat that knit structure changes the feel as much as weight does:
120 to 160gsm. Summer weight. Drapes close to the body, and on a light colour it will show what is underneath. This is where most fast fashion t-shirts sit, because less cloth costs less.
170 to 240gsm. The everyday range. Opaque, holds a shoulder line, keeps its shape through a day of wear. A well made tee usually lives here.
250 to 350gsm. Sweatshirt territory. Substantial enough to hang rather than cling, warm, and slow to dry.
350gsm and up. Heavy. Structured, and it will feel like an object when you pick it up off a chair.
Our washed jogger is 360 g/m2, which is 10.6 ounces per square yard if you think in those units. That is at the heavy end deliberately. It is the difference between a jogger that keeps its line after a year and one that goes soft at the knee and stays there.
Why heavier is not better
This is where the number gets misused, and heavyweight has become a marketing word precisely because it sounds like an achievement.
Weight tells you nothing about fibre length, yarn twist, knit consistency or finishing, and those are what separate a cloth that ages well from one that pills in a season. A heavy cloth made from short, poorly spun fibre is a heavy bad cloth. A fine 160gsm cotton from long staple yarn can outlast it easily.
Weight is a description of the cloth, not a verdict on it. The right weight is the one that suits what the garment is for.
A 360gsm t-shirt would be a bad t-shirt. It would be hot, slow to dry, and it would hang off the shoulders like a board. The weight that makes our jogger good would ruin a summer tee, and that is the point: the number lets you judge whether a garment is built for what you want it for, which no adjective can do.
What to do with it
When you are comparing two garments and one lists a weight and the other does not, that absence is information. Not proof of anything, but a signal about how much the seller expects you to check.
Where we have measured a cloth, the weight is on the product page in the specification block, next to the composition. Where we have not, it is absent rather than estimated, because a made-up number is worse than no number. You can see the whole line in the catalogue.