What Is GSM in T-Shirts? Understanding 160, 180 and 240 GSM

You find two T-shirts online. One says 180 GSM and the other says 240 GSM. Is the second automatically better? The number tells you something useful, but it cannot make the buying decision on its own.

What the number actually measures

GSM stands for grams per square metre: the mass of one square metre of fabric. It lets you compare equal areas of material. A finished large T-shirt may weigh more than a small one made from the same fabric because it uses more material.

Think about bedsheets and blankets

You would not choose a blanket only because it weighs more than a bedsheet. You would ask when and where you plan to use it. Apply the same thinking to T-shirts: consider the weather, layering and the silhouette you enjoy.

How common weights compare

These are comparisons, not fixed quality grades. Two fabrics with the same GSM can feel different because of yarn, knit, finish and fibre composition. Weight is related to thickness, but does not measure it directly.

What GSM cannot promise

It does not tell you whether the neckline will hold its shape, whether the seams are tidy or how the print was applied. It also cannot guarantee that a white tee is opaque. Product photographs, construction details and care information still matter.

Choosing for your routine

For a warm commute, consider the fabric, fit and print coverage as well as GSM. For layering, check how the tee sits under your shirt or jacket. For a more substantial silhouette, compare garment measurements instead of assuming weight creates an oversized fit.

The Akaza graphic tee is listed at 180 GSM. Use that as one part of your comparison, alongside its cotton fabric and regular fit. For the wider checklist, read our guide to choosing a T-shirt.