GSM shows up on nearly every fabric description you'll read, and most people skip past it without knowing what it actually tells them. It's one of the most useful numbers on a product page once you know how to read it.
What GSM Actually Means
GSM stands for grams per square metre — literally how much a single square metre of the fabric weighs. It's a direct measure of fabric density and weight, independent of the fibre itself. A 200 GSM cotton and a 200 GSM linen will feel different, but they're carrying a comparable amount of fabric per unit area.
Why It Matters More Than "Thick" or "Thin"
Description words like "lightweight" or "structured" are subjective and vary between brands. GSM is an actual number you can compare directly across products — useful when you're choosing between two similar-looking pieces and want to know which will actually feel heavier or hold more structure.
Rough GSM Ranges to Know
Under 150 GSM — very lightweight, typically sheer or semi-sheer fabrics. Good for layering pieces or peak summer heat, less good for structure.
150–200 GSM — the range most everyday shirts and lighter dresses fall into. Breathable, drapes well, holds a basic shape.
200–280 GSM — mid-weight, where you'll find most structured knits and rib fabrics. Our Soft Cotton Rib Collection sits at 280 GSM — substantial enough to hold a fitted silhouette without losing breathability.
Above 280 GSM — heavier fabrics, denim territory. More structure and durability, less suited to peak summer heat unless the weave allows for airflow.
How to Use This When Shopping
If a product description gives you a GSM number, use it to sanity-check the fit and drape description — a "flowy" dress at 220 GSM will drape noticeably differently than one at 140 GSM, regardless of how the photos look. If you know you run warm and prefer lighter fabric, look for pieces under 200 GSM. If you want a fabric that holds its shape all day, 250 GSM and above is usually a safer bet.
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