Heavyweight jersey is the fabric behind the premium streetwear t-shirt. At 220–240 g/m², it has enough body to hold a structured silhouette on its own — no lining, no interlining, just the weight of the fabric doing the work. Pick it up and it feels substantial. That weight is part of the product.
This is 100% cotton, no elastane. The rigidity comes from the density of the knit, not from a stretch fiber. The result is a fabric that drapes away from the body rather than conforming to it — which is exactly what you want for an oversized fit.
Use heavyweight jersey when the weight and structure of the fabric are part of the product experience. It costs more per meter and per unit — make sure that's reflected in your retail price.
The oversized silhouette and fabric weight
There's a reason heavyweight jersey became the default for oversized t-shirts. A lighter fabric in an oversized cut tends to collapse — it bunches, shifts, and loses its shape. A heavier fabric holds the drop shoulder in place, keeps the hem level, and maintains the boxy silhouette through movement and washing.
When you're designing an oversized t-shirt, the fabric weight is a silhouette decision, not just a material decision. Spec too light and the design doesn't read the way you intended.
How it compares to other jerseys
Production specs for your tech pack
| Spec | Value | Notes |
|---|---|---|
| Fabric type | Single jersey knit | Dense construction, not woven |
| Weight (GSM) | 220–240 g/m² | Tolerance ±5 g/m² |
| Fiber content | 100% Cotton | Ring-spun or open-end spun |
| Shrinkage | Max 5% after wash | Sanforized finish strongly recommended |
| Dyeing method | Piece dyed (reactive) | For solid colors |
| Color standard | Pantone TCX | Textile Cotton eXtended palette |
In FlatLabs PRO, heavyweight jersey automatically triggers a Sanforized finish recommendation in your construction notes — because at this weight, pre-shrinking is critical for consistent sizing across a production run.
Cost implications
Heavyweight jersey uses significantly more fiber per square meter than midweight. That cost difference compounds across a full production run. A 500-unit order in heavyweight jersey versus midweight can represent a meaningful difference in fabric cost alone — before cutting, sewing, or finishing.
This isn't a reason to avoid it. It's a reason to make sure your retail price reflects the material cost, and that your BOM accurately captures the GSM so your factory quotes against the right spec.