If you are sourcing hoodies, GSM is the number everyone quotes and almost nobody explains honestly. After 20+ years running fleece production in Tirupur, here is the truth about what GSM actually means for a hoodie, which weights real brands use, and why some of the numbers you see advertised online are not physically possible. This is written from the factory floor, not from a spec sheet.
What Does GSM Mean for a Hoodie?
GSM stands for grams per square metre, and it measures the weight of the fabric, not the quality of the garment. A higher GSM fleece is heavier and warmer; a lower GSM fleece is lighter and more breathable. The mistake most buyers make is treating GSM as a quality score. It is not. A well-constructed 280 GSM hoodie will outperform a badly made 400 GSM one every time, because construction, yarn, and finishing matter as much as raw weight.
Two-Thread vs Three-Thread Fleece (the part most guides skip)
This is the distinction that actually determines what your hoodie feels like, and it is the thing generic GSM articles never mention. Fleece is knitted in two structures:
Two-thread fleece runs roughly 180 to 260 GSM and is used mostly for sweatshirts and lighter pieces. When it is knitted using lower yarn counts on the backside, the fabric reads as thicker and looks fuller than the weight suggests, which is a useful trick for a premium feel at a sensible cost.
Three-thread fleece runs roughly 280 to 500 GSM and is what serious hoodies are built from. When three-thread fleece is knitted using a poly-cotton yarn, the brushing process on the inside produces an excellent, even, soft loft that holds up well, which is why it is our default for premium hoodie programs. A point worth knowing: 100% cotton fleece does not take the brushing effect as cleanly, so if a soft brushed interior is the goal, the blend matters.
The GSM Weights Hoodie Manufacturers Actually Use
People search for specific numbers, so here is the honest verdict on each, mapped to what we genuinely run in production.
300 to 350 GSM Hoodie
The lighter end of real hoodie territory. Good for transitional weather, layering pieces, and warmer export markets. This is where a large share of everyday hoodie demand actually sits.
400 GSM Hoodie Manufacturer
A genuine heavyweight. Structured, warm, and well suited to streetwear silhouettes and colder markets. This is a real, frequently produced weight and a sensible ceiling for most premium programs. The honest caveat: at 400 GSM the fabric becomes rigid enough that stitching has to be adjusted, because needle deflection on heavier three-thread fleece is a real production issue if the factory is not set up for it.
450 to 500 GSM Hoodie
The top of the practical three-thread range. We can and do produce up to around 500 GSM for winterwear and statement pieces, but you are now paying a clear premium and the garment is heavy to wear. Above 500 GSM, production becomes specialised and rare.
1000 GSM Hoodie: the honest truth
People search for “1000 GSM hoodie manufacturer,” so let us be direct: a wearable 1000 GSM hoodie is not a real production weight. At that weight you are into blanket and upholstery territory, not garments someone can comfortably wear or that a sewing line can construct into a hoodie. If a supplier is advertising 1000 GSM hoodies, they are either misquoting the number or describing something that will not behave like a hoodie. The genuinely heavy, wearable ceiling sits around 500 GSM.
Hoodie GSM Chart: Weight, Fleece Type and Best Use
| GSM | Fleece Structure | Feel & Warmth | Best For |
|---|---|---|---|
| 240 GSM | Two-thread / light three-thread | Light, breathable | Lighter hoodies, sweatshirt crossovers, warm climates |
| 260 GSM | Two-thread / three-thread | Light-medium, good drape | Everyday hoodies with a relaxed feel |
| 280 GSM | Three-thread | Substantial, premium | Sweet spot. Premium everyday hoodies |
| 300 GSM | Three-thread | Balanced, structured | Sweet spot. The most balanced all-round weight |
| 340 GSM | Three-thread | Heavy, warm | Structured hoodies without becoming bulky |
| 400 GSM | Three-thread | Genuine heavyweight | Streetwear silhouettes, cold markets (needs adjusted stitching) |
| 450 to 500 GSM | Three-thread (top of range) | Very heavy, premium | Winterwear and statement pieces, at a clear premium |
| 1000 GSM | Not applicable | Not wearable | Not a real hoodie weight, this is blanket territory |
The genuinely popular production weights are 240 to 340 GSM. The heavy, wearable ceiling is around 500 GSM.
The Top 5 Hoodie GSM Weights We Run in Production
Stripped of marketing, these are the weights that move in real export orders:
- 240 GSM — lighter hoodies and heavier sweatshirt crossovers.
- 260 GSM — a popular everyday weight with good drape.
- 280 GSM — the start of the premium sweet spot, three-thread.
- 300 GSM — the most balanced all-round hoodie weight.
- 340 GSM — a substantial, structured feel without becoming heavy.
Notice these sit lower than the inflated 450 to 600 GSM numbers many listicles push. That is the reality of what genuinely sells and wears well.
What About Cost?
GSM and cost move together, because you are quite literally buying more fabric per garment as the weight climbs. The increase is modest but real, and it compounds across a bulk order, so the jump from a 240 GSM hoodie to a 280 GSM hoodie is a meaningful line on a costing sheet rather than a rounding error. The practical takeaway is to choose the lowest GSM that delivers the feel your brand needs, rather than defaulting to the heaviest number available.
French Terry vs Fleece, and Shrinkage
French terry has loops on the inside, sits lighter, and drapes better, which suits warmer-climate hoodies. Brushed fleece has a soft, warm interior and carries more weight. Both are knitted at the GSM ranges above; the choice is about feel and climate, not just weight. On shrinkage, fleece will move if it is not controlled, and we arrest shrinkage to within 5% through proper fabric relaxation and finishing, which is the tolerance a serious brand should be specifying in the tech pack.
Our honest recommendation
For a brand building a hoodie line, 280 to 300 GSM three-thread fleece is where we steer most clients. It reads as premium, wears comfortably across seasons, controls cost, and constructs cleanly. We produce from a minimum of 300 pieces per colour, and the right weight for your specific market is a conversation worth having before you commit to bulk. The detail in your t-shirt GSM choices follows the same logic, and our 400 GSM heavyweight knits case study shows how we handle stitching on the heaviest weights.
Frequently Asked Questions
What is a good GSM for hoodies?
For most brands, 280 to 300 GSM three-thread fleece is the sweet spot. It balances a premium, substantial feel with comfortable wearability and sensible cost. Lighter 240 to 260 GSM suits warmer markets, while 400 GSM suits heavyweight streetwear and cold climates.
Is a 1000 GSM hoodie real?
No. A wearable 1000 GSM hoodie is not a genuine production weight. At that weight the fabric is closer to a blanket and cannot be constructed or worn as a normal hoodie. The practical heavyweight ceiling for a real hoodie is around 500 GSM.
What is the difference between two-thread and three-thread fleece?
Two-thread fleece runs roughly 180 to 260 GSM and is used mostly for sweatshirts and lighter pieces. Three-thread fleece runs roughly 280 to 500 GSM and is what proper hoodies are made from, offering more structure and a better brushed interior, especially in a poly-cotton blend.
What GSM do most hoodie brands actually use?
In real export production the most common hoodie weights are 240, 260, 280, 300, and 340 GSM. These sell and wear better than the inflated 450 to 600 GSM figures often advertised online.
Does a higher GSM mean a better hoodie?
No. GSM measures fabric weight, not quality. A well-constructed 280 GSM hoodie with good yarn, brushing, and finishing will outperform a poorly made heavier one. Construction and finishing matter as much as raw weight.
How much does a fleece hoodie shrink?
Uncontrolled fleece can shrink noticeably, but with proper fabric relaxation and finishing we arrest shrinkage to within 5%, which is the tolerance a brand should specify in the tech pack.
About the Author: Karthik Shan
Karthik Shan is the founder and CEO of The Synerg, with 20+ years in the Tirupur textile hub. He publishes practical playbooks for brands on fabric GSM, costing (CM/CMT), AQL quality standards, and export-ready production.