Fabric weight and GSM means a measurement of fabric mass, usually stated as grams per square metre.
Why it matters in practice
GSM helps compare weight, but it does not alone predict opacity, warmth, durability or quality because fibre and construction also matter.
A useful check before buying
Use GSM together with density, stretch, drape and the intended garment. A light compact cloth may behave very differently from a bulky knit of similar weight.
What to keep in mind
When a product description mentions Fabric weight and GSM, return to the garment and verify the claim. Ask what the feature changes for your body, your day and the long-term care of the piece.
