GSM — grams per square metre — is the most useful simple number on a sportswear spec sheet, as long as you do not treat it as a quality score.
What GSM measures — and what it does not
GSM measures mass over area. It does not measure stretch, wicking, pilling, colourfastness or whether a white short is opaque. Two 160 GSM meshes can wear like different products. Still, GSM is how you stop a conversation that says only “make it thicker.”
Buyers should ask for GSM together with construction: interlock, bird eye, fleece, rib. A 280 GSM fleece hoodie and a 280 GSM jersey knit are not interchangeable. Abijah Sports writes both on the sheet.
Practical ranges by garment type
Team jerseys often live in a mid-weight polyester band that balances print face and heat. Shorts may sit in a similar or slightly different band depending on lining. Fleece hoodies sit much higher. Compression rash guards are chosen for stretch and recovery first; GSM is supporting information.
We do not publish a fake “standard GSM list” as if every club in every climate shared one number. We confirm GSM when the fabric is nominated or when a reference is measured. That is slower than a marketing table and more honest.
Hand, opacity and climate
Hand is how the cloth feels in the fist and on the skin. A high-GSM mesh can still feel dry and open. A mid-GSM interlock can feel cooked in a humid gym. Opacity is a lighting test: hold the garment up, stretch it, look again. Climate is the third axis. What works for an indoor Canadian season may be wrong for an outdoor Middle East event.
Finishes — wicking, anti-odour, peach — change perception without changing GSM much. If a finish matters, name it. If it does not, do not pay for a story.
How to write GSM on an order
Write: construction + fibre + target GSM + tolerance if you have one + a reference if you have one. Example: “100% polyester bird eye, target 140–150 GSM, match sent swatch.” That sentence is worth more than a paragraph of adjectives.
Related reading: basketball fabrics and fabric inspection. To lock a cloth, send a swatch or a garment to the conversation started on Get a Quote.
How mills talk and how buyers should translate
Mills quote construction, yarn, width and GSM. Traders sometimes quote only a nickname: “football fabric,” “basketball mesh,” “hoodie cloth.” Nicknames are not specs. When you hear a nickname, ask for construction and GSM. If the answer cannot be written, you do not have a fabric yet.
Width matters for yield and therefore for price, but it should not be the reason you pick a cloth that fails opacity. Yield is a factory concern we manage after the cloth is right. Do not choose a fabric because it “nests well” if it cannot survive a gym photograph.
Fleece, French terry and the hoodie problem
Hoodies are where GSM gets used as a brag. A number without a face and back description is still a brag. Ask whether the face pills, whether the hood has enough structure, and whether the rib matches after wash. A 400 GSM claim on a poorly finished fleece is not a gift to your customer.
Climate still wins. Shipping a heavy fleece into a hot market because a competitor’s lookbook used it is how you collect returns. Pair fleece GSM with the destination, not with an internet argument.
Compression knits and why GSM is secondary
Rash guards and tights are judged on stretch, recovery, opacity and seam comfort. Two knits with the same GSM can perform differently because elastane content and knit structure differ. Measure recovery on a sample. Do not buy compression on GSM alone.
If you are writing a first spec, use GSM as a fence, not as a personality. “Interlock, 100% polyester, 160–180 GSM, match swatch” is a fence. “Make it luxurious” is not.
Abijah Sports will confirm the nominated cloth on sample. Send a swatch when you can. When you cannot, send a garment. When you have neither, be prepared for an extra sampling loop. That loop is cheaper than a wrong bulk roll.
Using GSM in a quote without getting misled
When a quote returns, look for construction and GSM together. If you see only a nickname, ask again. If you see a GSM with no tolerance and no construction, ask again. If the number is a range, ask what happens when a roll arrives at the bottom of the range on a white short — that is the opacity question in disguise.
Keep swatches dated. A cloth you loved in spring may not be available in autumn under the same mill code. Availability is a manufacturing fact. Your job is to approve a replacement with eyes open, not to assume a nickname lasts forever.
Abijah Sports will write the cloth in language you can reuse on a reorder. That sentence on a sheet is the whole point of GSM: memory that survives a busy season.
Questions
No. Higher is heavier and often more opaque. Better depends on sport, climate and the wearer.
Construction, yarn and finishing change hand. GSM is only mass per area.
We can measure a reference sample you send. A photo cannot give GSM.