What Is 240 GSM Interlock Jersey? The Heavyweight T-Shirt Fabric Explained

Not all t-shirts are created equal. The fabric weight and knit structure make a huge difference in how a shirt feels, drapes and lasts. Here is what 240 GSM interlock jersey means and why it matters for your custom shirts.

What does GSM mean?

GSM stands for grams per square meter — the weight of the fabric. A standard promotional t-shirt is often 140-160 GSM and can feel thin and flimsy. Our shirts are 240 GSM, roughly 50% heavier than a basic tee.

What is interlock jersey?

Interlock is a double-knit construction: two layers of jersey knit together into one thicker, smoother fabric. Compared to single jersey, interlock is heavier, more stable and resists pilling and shrinking. That is why we chose it.

Why 100% ring-spun combed cotton?

ring-spun combed cotton is made by twisting and thinning the cotton fibres, creating a softer, stronger yarn than regular cotton. Combined with interlock knitting, you get a premium hand-feel that gets better with every wash.

The bottom line

Our custom t-shirts are printed on 240 GSM interlock jersey — 100% ring-spun combed cotton. They are up to 70% heavier than competitor tees, hold their shape, and our DTF prints survive 50+ wash cycles.

Experience the difference yourself — order your custom t-shirt pack today with free US delivery.