How is fabric GSM measured?
GSM is measured by cutting a fixed, known area of fabric — often a 100cm² circular sample — weighing it precisely, and converting that weight to grams per square meter. It's a physical lab measurement, not a factory estimate. We use exactly this process, and where our lab number disagreed with the factory's paper spec, we published the lab number instead.
Most fabric weights a shopper sees online come from a supplier spec sheet, copied forward from factory to factory, sometimes for years, without anyone re-weighing the cloth. We didn’t want to publish a number we hadn’t checked ourselves. In August 2026 we lab-tested every fabric in the line — cutting and weighing physical samples rather than relying on the paperwork — and in three cases the lab number and the factory number disagreed: our Quiet Sweatshirt’s fiber blend corrected from a stated 95/5 to a measured 96/4 cotton-spandex, its weight from 280 to 282 GSM; our two terry pieces corrected from a provisional 220 to a measured 340 GSM; our caftan corrected from 128 to 136 GSM. Every number on this site carries the lab result, not the older paper spec — that’s what “lab-verified” means wherever you see it on this site, on every product page and in this guide.
| Piece | GSM | Fabric |
|---|---|---|
| The Soft Layer | 340 | 100% Cotton |
| The Easy Trouser | 340 | 100% Cotton |
| The Quiet Sweatshirt | 282 | 95% Cotton / 5% Spandex (Lycra) |
| The Everyday Tee | 270 | 100% Cotton |
| The Weekend Trouser | 270 | 90% Cotton / 10% Polyester |
| The Long Quiet | 136 | 50% Jute / 50% Cotton |