There is a number that rarely makes it onto the front of a garment but tells you almost everything about its quality. It is GSM, or grams per square metre, the measure of how much a fabric weighs. Once you understand it, you cannot unsee it.
What GSM Actually Measures
GSM describes the density of a textile. A higher number means more fibre per square metre, which generally translates to a fabric that is heavier, more substantial, and more durable. A standard high-street T-shirt might sit around 150 GSM. A heavyweight, structured tee can reach 300 GSM or more. The difference is immediate in the hand.
Why Heavier Often Means Better
Weight brings structure. A heavier cloth holds its shape, drapes in a cleaner line, and resists the sagging and thinning that make lighter garments look tired after a few washes. It also lasts. A heavyweight piece is an investment that ages slowly, where a lightweight one is often disposable by design.
This is why considered menswear leans into weight. A 320 GSM base layer, a 400 GSM hoodie, a 14oz denim: these numbers signal a garment built to be relied upon, not replaced.
When Lighter Is the Right Choice
Heavier is not always better. Warm-weather garments, technical performance pieces, and certain tailored shapes call for lighter, more breathable cloth. The point is not to chase the highest number but to match the weight to the purpose. A well-made brand chooses its GSM deliberately for every piece.
How to Use This Knowledge
When you shop, look for the weight. A brand that publishes its GSM is telling you it has nothing to hide. At Calton Brown, weight is specified by design, from the heavyweight construction of The Foundation base layers to the statuesque trousers of The Standard. The number is part of the engineering.
Explore heavyweight British menswear, specified by weight, at Calton Brown.
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