GSM Explained: Choosing the Right Fabric Weight for Your Product

What GSM actually measures

GSM is the weight of one square metre of fabric. A higher number means a denser, heavier, usually more opaque and structured fabric; a lower number means lighter, softer, and more breathable. It does not, on its own, tell you about fibre quality, construction, or durability — a well-made 180 GSM tee can outlast a poorly made 240 GSM one.

A weight-by-weight guide for knits

• 130–150 GSM — lightweight promo and fashion tees: airy, drapey, budget-friendly for giveaways and layering
• 160–190 GSM — the retail standard: the classic everyday t-shirt weight, balanced and versatile
• 200–230 GSM — premium tees: substantial, holds shape, a quality retail feel
• 240–280 GSM — heavyweight and boxy streetwear blanks: structured, opaque, that "expensive" hand-feel
• 280–320+ GSM — super-heavy tees and lighter sweats: maximum structure for premium streetwear
• 300–500+ GSM (fleece/terry) — hoodies and sweatshirts, from lightweight to ultra-heavy

How to choose for your product

Match the weight to the positioning. Promotional and event apparel usually lives at 140–180 GSM to hit a price point. Retail basics sit at 180–220 GSM. Premium and heavyweight streetwear starts around 240 GSM and climbs from there.

Remember that heavier is not automatically better — it is warmer, costs more in fabric, and drapes differently. The right answer depends on climate, use, and brand feel.

Always approve a physical sample

GSM gets you close, but knit construction, finishing, and fibre all change how a given weight feels in the hand. The reliable move is to approve a physical sample in your exact fabric before committing to bulk — every order we run is locked against that approved sample.