GSM is one of the most important specifications in apparel manufacturing. Yet many buyers ordering clothing for the first time do not fully understand what it means, how to specify it correctly or how it affects the cost and quality of their product.
What Does GSM Stand For?
GSM stands for grams per square metre. It is the standard measurement of fabric weight — how heavy one square metre of the fabric is in grams. A higher GSM means heavier, thicker, denser fabric. A lower GSM means lighter, thinner fabric.
GSM applies to all fabric types — jersey, fleece, French terry, pique, interlock and woven fabrics. It is used universally in apparel manufacturing and is the standard way to specify fabric weight in purchase orders, tech packs and quality control documents.
Why GSM Matters
GSM affects three things that matter directly to your brand:
- Feel and quality perception — heavier fabric feels more premium in the hand. Consumers associate weight with quality, particularly in knitwear categories.
- Cost — heavier fabric uses more raw material. A 320gsm hoodie costs more than a 280gsm hoodie in the same construction.
- Performance — heavier fabric is warmer, more durable and holds shape better. Lighter fabric is more breathable and drapes better.
GSM Guide by Product Category
T-Shirts
- 130–160gsm — very lightweight. Suitable for summer basics and layering pieces. Feels thin — used for budget and promotional programmes.
- 160–180gsm — standard retail t-shirt weight. The most common range for high-street basics.
- 180–200gsm — midweight premium. Noticeably better hand feel. Used by brands positioning above the basics market.
- 200–220gsm — heavyweight t-shirt. Premium feel, holds its shape well, takes embroidery cleanly. Used by streetwear brands and premium casualwear.
Hoodies and Sweatshirts
- 240–280gsm — lightweight hoodie. Budget and promotional range. Feels noticeably thin compared to retail expectations.
- 280–320gsm — standard retail hoodie weight. Suitable for most mid-market brands.
- 320–360gsm — premium hoodie. Noticeable weight. The most requested range for streetwear and premium casualwear.
- 360–400gsm+ — heavyweight premium. Significant cost premium. Distinctly luxurious feel. Used by premium brands at higher retail price points.
Polo Shirts
- 180–200gsm — lightweight polo. Suitable for summer and warm-weather markets.
- 200–220gsm — standard polo weight. Suitable for corporate and casualwear programmes.
- 220–240gsm — structured polo. Holds its shape well. Preferred for premium corporate and sportswear.
Loungewear
- 220–260gsm — lightweight loungewear. Suitable for spring/summer and warmer climates.
- 260–300gsm — standard loungewear weight. Soft, comfortable, good drape.
How to Specify GSM in Your Order
Always specify GSM explicitly in your tech pack or purchase order. Do not leave it to the manufacturer's discretion — they will default to the most cost-effective weight for them, which may not match your quality expectations.
If you are unsure which GSM to specify, request samples in two different weights and compare the hand feel before committing. A good manufacturer will offer this as part of the pre-production sampling process.
Always request a weight confirmation on pre-production samples. Manufacturers sometimes substitute lighter fabric to reduce cost. A lab test of your sample will confirm the actual GSM matches your specification.