GSM Explained: What Fabric Weight Means When You Order
By The Velocity Wear Team
GSM means grams per square metre — the weight of the fabric, not the garment. Higher GSM means denser, heavier, more substantial fabric. As a rough guide, t-shirts run from around 140 GSM to 220 GSM and above, while hoodies and sweatshirts run from around 280 GSM to 400 GSM and above.
Why GSM Matters More Than Anything Else
If you change one specification on an order, change this one. Fabric weight determines how a garment drapes, how opaque it is, how warm it is, how long it holds its shape, and — more than any other single factor — whether it feels premium in the hand. Two shirts with identical printing, identical fit and identical colour will be judged completely differently if one is 150 GSM and the other is 200.
Typical T-Shirt Weights
The range is wider than most buyers realise.
- Around 140–160 GSM: light. Suitable for giveaways, event tees and hot-weather use, but thin enough that it can be slightly translucent in pale colours.
- Around 180 GSM: the common mid-weight and a reasonable default for general merch.
- Around 200–220 GSM: substantial, opaque, holds shape well, and the range most retail-focused brands choose.
- Above 220 GSM: genuinely heavyweight, structured, and the current standard for premium streetwear tees.
Typical Hoodie and Sweatshirt Weights
Around 280–300 GSM is light — fine for summer layering and cost-sensitive runs, but it will not feel premium. Around 320–350 GSM is the practical middle ground and the most common merch choice. From 400 GSM upwards you are into genuinely heavyweight territory: structured, warm, and the weight that supports a higher retail price. The jump from 300 to 400 GSM is immediately obvious to anyone handling both.
GSM and Cost
Heavier fabric costs more, but the difference across a full run is often smaller than buyers assume, because decoration costs are unchanged — printing a 400 GSM hoodie costs the same as printing a 280 GSM one. If you are selling the garment, the heavier blank frequently supports a higher price by more than it adds to your cost. The free instant price calculator lets you compare weights across your actual quantity rather than guessing.
“"Nobody has ever picked up a heavyweight hoodie and asked why it costs more. They can feel the answer."”
GSM and Printing
Heavier fabrics generally take print well and provide a stable surface. Very light fabrics can show print more harshly on the reverse and are less forgiving of dense ink coverage. For embroidery, sufficient fabric weight matters more still — lightweight garments can pucker under dense stitching, which is why embroidery is usually specified on polos, fleeces and heavier sweatshirts rather than thin tees.
Choosing
Ask what the garment is for. Giveaway at an event, worn once? Light is fine. Sold to a customer who is choosing to spend money? Go heavier. Worn as uniform for two years? Weight plus a blend that resists shrinking. Orders start at 20 pieces with mixed sizes, so you can order a run and assess the weight in hand before scaling.