240 GSM vs 180 GSM: What T-Shirt Weight Actually Means

240 GSM is a heavyweight tee — opaque, structured, and built to hold its shape. 180 GSM is a standard-to-light tee — thinner, softer out of the bag, but quicker to go see-through and lose its cut. If you want something that survives training and washing, 240 GSM is the buy. If you want the lightest possible summer layer, 180 has its place.

What GSM measures

GSM is grams per square meter — literally how much fabric is packed into the shirt. Higher GSM = more material = more opacity, structure, and durability. It's the single most useful spec on a tee, and most brands bury it.

The three tiers

• 150–180 GSM (standard/light): thin, soft, cheap. Goes transparent under bright light, stretches out fast. Fine for a throwaway layer, bad for anything you want to keep.
• 220–260 GSM (heavyweight): structured, opaque, holds its cut through training and the wash. The wearable heavyweight. Our tees sit at 240.
• 300+ GSM (ultra-heavy): thick and stiff, runs hot, feels like armor. Looks impressive hanging up, fights you the second you move.

Why 240 is the sweet spot for training

Heavy enough to look and feel like real heavyweight — opaque, holds the drop-shoulder shape — but still breathable and mobile enough to actually lift in. You get the structure without the heat trap.

The catch with lighter tees

180 GSM feels great for the first few wears, then the wash cycle exposes it: thinning fabric, stretched collar, a print starting to crack. You're replacing it in a season. A 240 GSM tee costs a little more up front and outlasts three of them.

Weight is the difference between gear and garbage. See the 240 GSM lineup, or read what makes a good heavyweight tee.

FAQ

Is 240 GSM heavy for a t-shirt?
It's the top of standard heavyweight — noticeably thicker and more opaque than a normal 150–180 GSM tee, but not a stiff 300+ GSM slab. Structured and still trainable.

Is a higher GSM always better?
No. Past ~260 GSM you gain stiffness and heat, not durability you'll notice. 240 is the practical ceiling for a tee you train in.

Can you tell GSM by feel?
Roughly. A heavyweight has obvious body and doesn't go translucent when you hold it to light. If you can read your hand through it, it's light.