How to read a GSM label (and why it matters in Dhaka heat)

GSM stands for grams per square metre. It describes how much a fabric weighs, and nothing else — a 180 GSM cotton can outlast a 240 GSM one if the yarn is better spun.

For everyday tees in this climate we settle around 180 GSM. Lighter than that and the fabric goes transparent after a few washes; heavier and it holds heat in a way that stops being comfortable by mid-morning.

Where GSM genuinely helps is comparing like with like. Two combed cotton tees, same construction, different weights — the heavier one will usually hold its shape longer and drape more cleanly.

For hoodies and sweatshirts the maths flips. There we look for 300 GSM and above, because the fleece backing needs enough body to stay soft after repeated washing rather than matting down.