Jersey Fabric GSM Explained, What Weight Should Your Team Order?
What GSM means on a team jersey, which weight suits which sport and climate, and how to avoid transparent fabric or a jersey that traps heat.
GSM stands for grams per square metre, how much a square metre of the fabric weighs. It is the single most useful number on a jersey spec sheet, and the one most suppliers avoid publishing.
The practical range
- 130–140 GSM, very light. Fast-drying, but prone to going translucent when soaked and to snagging. Fine for pinnies and hot-weather practice tops, risky for game jerseys.
- 150–160 GSM, the sweet spot for hot-climate game jerseys. Light enough for August football in Texas or Florida, opaque enough to look right under stadium lights.
- 170–190 GSM, a solid all-round game weight. Better drape, better durability, still breathable. Our default for most sports.
- 200–240 GSM, heavier. Good for baseball full button jerseys, cold weather programs and anything that needs structure.
- 260 GSM+, outerwear territory: quarter zips, warmup gear, fleece.
Weight is not the whole story
Two 170 GSM fabrics can behave completely differently depending on knit and finish:
Knit. Interlock is smoother and more opaque at the same weight. Micro mesh moves air far better but shows more light through. Bird's-eye mesh sits between the two.
Stretch. A little spandex (usually 5–12%) makes a huge difference in fit and range of motion, especially on compression pieces and baseball pants.
Finish. moisture wicking and anti-odour finishes affect how the jersey feels after the third quarter more than weight does.
Matching weight to sport
| Sport | Suggested game weight |
|---|---|
| Flag football / 7v7 | 150–170 GSM micro mesh |
| Tackle football | 170–190 GSM, reinforced shoulders |
| Basketball | 150–170 GSM interlock or mesh |
| Baseball / softball | 180–220 GSM interlock |
| Practice gear | 140–160 GSM |
| Sideline layers | 260 GSM+ |
Matching weight to climate
A jersey spec that works in Minnesota in October is wrong for Arizona in August. Hot-and-humid programs should drop a weight class and prioritise mesh. Cold-weather programs are usually better served keeping the game jersey standard and adding a proper base layer underneath, rather than making the jersey itself heavy.
The transparent test
Before you approve a sample, do this: hold the fabric over a printed page. If you can read the text easily, that jersey will be revealing when it is soaked in sweat, which matters a great deal for youth and girls' programs.
What to ask your supplier
- What is the GSM of the exact garment I am ordering?
- Is it interlock, mesh or micro mesh?
- What is the polyester/spandex split?
- Can I have a blank sample in that fabric before I commit?
Any supplier who cannot answer those four questions is guessing.
See our full materials and fabric breakdown, or start a team order and tell us your climate, we will recommend the weight.