What GSM Actually Means — and Why 95 GSM Mul Cotton Feels Like Air
There's a number printed on most clothing labels that almost no one explains. You'll see it on our pages too: 95 GSM, 120 GSM. It looks technical, so it gets ignored. That's a shame, because GSM is one of the few specs that genuinely tells you how a shirt will feel on your skin before you ever put it on.
Here's the whole idea in one line, and then we'll earn it.
GSM measures weight, not quality
GSM stands for grams per square metre — literally, how much one square metre of the fabric weighs. That's it. A 120 GSM cotton has more fibre packed into the same area than a 95 GSM cotton, so it's a little heavier, a little more opaque, and holds its shape a bit more.
What GSM does not measure is quality. This is the single biggest misconception we run into. A higher number is not a "better" fabric, and a lower number is not a "cheaper" one. A heavy 300 GSM fleece and a feather-light 95 GSM muslin can both be beautifully made or badly made. GSM only tells you the weight class — like knowing whether a vehicle is a scooter or an SUV. Neither is "better." They're built for different roads.
Why lower GSM is the point, not a compromise
For Indian weather, the instinct to equate "thicker = more value" works against you. A dense, high-GSM shirt traps heat and holds sweat against the skin. A lower-GSM weave lets air move through it and dries faster. That's why our lightest fabric, mul cotton at 95 GSM, feels like air — there's deliberately less between you and the breeze.
So when you see a low GSM on a ReZen shirt, read it as a design decision, not a corner cut. We chose breathability over bulk because a shirt you actually want to wear in 38°C is worth more than one that looks substantial on a hanger and feels like a furnace by 11 a.m.
The GSM sweet spot for Indian heat
As a rough guide for shirts in our climate:
- 90–110 GSM — very light, airy, slightly sheer. Best for peak summer and humid days.
- 110–140 GSM — light to mid-weight. Everyday wear, holds structure, works most of the year.
- 150 GSM and up — heavier. Better suited to winter layering or colder regions.
Most of what you want for an Indian summer lives in that first and second band — which is exactly where the KORA range sits.
ReZen's GSM, fabric by fabric
These are the canonical weights for our KORA shirts. Every product page and every piece of marketing should match these numbers — if you ever see a discrepancy, this guide is the source of truth.
| Fabric | GSM | What that weight feels like |
|---|---|---|
| Mul Cotton | 95 | The lightest in the range. Airy, soft, slightly sheer — the closest thing to wearing nothing on the hottest days. |
| Bamboo Cotton | 120 | A touch more body, with a smooth, almost silky drape. Light but not see-through. |
| Banana Cotton | 120 | Similar weight to bamboo, with a subtle natural texture and a crisp-soft hand. |
| Handloom Cotton | 120 | The same weight, but hand-woven, so it carries a gentle irregularity and a more "alive" texture. |
Notice that three of the four sit at the same 120 GSM. That's intentional — they share a weight class, so the real difference between them isn't heaviness, it's character: how the fibre is made, how it drapes, and how it ages. (We break that down shirt by shirt in our companion guide, linked below.)
How to actually use GSM when you shop
Next time you're comparing shirts — ours or anyone's — do three things:
- Match GSM to your climate, not your wallet. Lower for heat, higher for cool.
- Pair GSM with the weave. A 95 GSM mul and a 95 GSM dense poplin feel completely different even at the same weight; the weave decides airflow.
- Ignore "thicker means better." It almost never does for summer clothing.
That's the entire skill. One number, used well, saves you from a wardrobe full of shirts that looked right and felt wrong.
Find your weight. Explore the KORA collection → — four natural-fibre shirts, each at ₹1,699, built deliberately light for the way India actually feels.
Still deciding between fabrics? Read Mul vs Bamboo vs Banana vs Handloom: Which KORA Shirt Fits Your Summer →