What is GSM in t-shirts (and why it matters)

By Shivaan Seth, Founder

GSM is one of those terms brands throw around without explaining. It is actually simple, and once you get it, you will shop for t-shirts far more confidently.

What does GSM mean?

GSM stands for grams per square metre. It is just how much a fabric weighs for its size, which tells you how dense it is. Higher GSM means heavier and more structured. Lower GSM means lighter and more breathable. That is the whole idea.

The weight scale

~180 GSM Light, breathable

~250 GSM Substantial, structured

~350 GSM Dense, warm

Weights at a glance

Weight	Feel	Best for
~180 GSM	Light, fluid, breathable	Everyday tees & tops
~250 GSM	Substantial, holds shape	Heavy tees with structure
~350 GSM	Dense, warm, cosy	Sweatshirts & winter layers

Is a higher GSM better?

No. Heavier is not better, just different. A breezy summer tee wants a lighter weight. A structured tee or a sweatshirt wants more. The right GSM is the one that suits how you will wear it. The real mistake is using a flimsy, low weight fabric to cut costs and calling it "lightweight".

How to use GSM when you buy

• Summer and everyday: look for around 180 GSM.
• A tee that holds its shape: around 250 GSM.
• Warmth and sweatshirts: 300 GSM and up.

One number will not tell you everything. Fibre and construction matter just as much. But GSM is the quickest way to know how a piece will feel before you buy it.

Frequently asked questions

What is a good GSM for a t-shirt?

Around 180 GSM is ideal for a light, breathable everyday tee. Around 250 GSM gives you a heavier, more structured tee that holds its shape.

Does a higher GSM mean better quality?

Not on its own. A higher GSM is heavier, not automatically better. Quality comes from the fibre, the weight being right for the garment, and how it is made.

What GSM are Better Basics tees?

Our everyday tees sit around 180 GSM, and our heavy cotton tees around 250 GSM, so you can pick by the feel you want.

Want to go deeper on fabrics? Read cotton blend vs modal vs heavy cotton, or browse women's or men's.

Shivaan

See the weights in practice: heavy cotton · men's tees · women's tees & tops.