A heavyweight hoodie is not automatically a better hoodie. Above roughly 380gsm, the mass itself guarantees thickness and drape, whatever the finishing. Below it, you are buying process instead: a well-brushed 300gsm can approach the hand-feel of a 420gsm, but it never quite arrives. The gap shows up in two places most buyers underestimate — around 30% on fabric cost, and roughly half a kilo per garment on every parcel you ship.
Weight buys thickness — above a point
GSM is a weight per square metre, not a thickness. Below about 350gsm, how thick a fleece feels depends heavily on things the GSM number says nothing about: machine gauge, stitch length, and above all the brushing level, which lifts fibre from the back and traps air. Two 320gsm fleeces from two mills can sit far apart on hand-feel with identical specification sheets.
Above 380gsm that stops being true. A heavy cloth hangs under its own weight regardless of how the back was finished — the pile can be short, the finish plain, and the garment still falls straight and feels substantial.
| Streetwear / independent | Mainstream retail | |
|---|---|---|
| Typical fleece weight | 380–450gsm, sometimes higher | 260–320gsm |
| What carries the hand-feel | The weight itself | Brushing quality |
| Fit convention | Often oversized, boxy | Regular |
| Garment weight | Roughly 1–1.5kg | Roughly 0.6–1kg |
| Fabric cost | Baseline + up to ~30% | Baseline |
This is why heavyweight programmes are easier to specify. The number does the work, and a buyer who orders 420gsm knows what will arrive. It is also why the heavyweight segment has a cost floor that cannot be engineered away: you can approach that hand-feel at 300gsm by brushing harder, but you cannot reach it. Brushing raises perceived thickness. Drape comes from mass.
What the 30% is really buying
Fabric is bought by weight, so the price per kilogram does not change when you change GSM within the same quality. The 30% is real, but it is the smallest line in the difference.
| Cost line | What happens | Shows on a fabric quote? |
|---|---|---|
| Fabric rate per kg | Unchanged within the same quality | Yes — and it misleads |
| Kilos per garment | Rises with weight | Partly |
| Metres per garment | Rises again if the fit was re-graded | No |
| Freight and warehousing | Rises with billable weight | No |
A check that needs no assumptions beyond the cloth: hold the pattern constant and move from 320gsm to 400gsm. The same panels, same area, weigh 25% more — 400 ÷ 320 = 1.25. That is the smaller half of the increase, because it ignores grading and freight entirely.
The half-kilo problem
A heavyweight oversized hoodie lands around 1–1.5kg. A 260–320gsm hoodie lands around 0.6–1kg. The gap at the top of each range is roughly half a kilo per garment.
Half a kilo is nothing in the hand and considerable on a pallet. A 500-piece order carries about 250kg of extra billable weight before packaging. On air freight that is charged directly; on sea freight it eats container payload. And as more apparel revenue moves online, the same figure repeats per parcel — outbound, and again on the return. In markets where postage is priced in weight bands, half a kilo can move every order into the next band.
Weight is also a burden for the wearer. A hoodie that reads as premium on a hanger can read as heavy on the shoulders by evening, which is one reason heavyweight programmes concentrate in categories where the garment is worn as a statement rather than all day.
Choosing by channel
| Situation | Weight that tends to work | Why |
|---|---|---|
| Streetwear, drop-led, high AOV, domestic fulfilment | 380–450gsm | Weight is the product; margin absorbs freight |
| Retail programme, multi-size, high volume | 260–320gsm | Consistent fit across sizes, lower landed cost |
| E-commerce, international, low AOV | 260–320gsm, strong brushing | Half a kilo compounds on every parcel |
| One body, two channels | Two fit blocks | The same pattern in both bands produces two different fits |
Heavier cloth occupies more space inside the same pattern, so a fit approved at 300gsm will read tighter at 420gsm. If the look must be preserved, the pattern moves — and that is where the extra metres, and the extra cost, come from.
What to specify
- Structure and weight together — "380–450gsm brushed fleece", not "heavy fleece"
- Brushing level or pile height, asked for by name. Two 320gsm fleeces can sit at opposite ends with identical-looking sheets
- Target garment weight in kilos, not only fabric GSM — this is the number that drives freight
- Which fabric the fit block was developed on, and whether fit or weight is fixed
- Tolerance and shrinkage as numbers against a named wash method
The fourth item saves the most time. "420gsm, and it must fit like the 300gsm sample" tells the factory the pattern has to move. "This pattern, and it must be 420gsm" accepts that the fit will change. Different briefs, different prices.
How we work with buyers
We run programmes from 500 pieces per style and colour, with a counter sample before bulk and final inspection to AQL 2.5, through certified partner factories in China and Bangladesh.
The weight decision is where we spend the most time, because it is the one that cannot be reversed later without re-quoting the whole programme. Our job is not to sell the heaviest fabric available — it is to say honestly whether the weight a brand has chosen supports the channel it intends to sell through, and what the alternatives cost at the fabric, garment and parcel level. We advise from four positions at once: producer, supplier to wholesalers, partner to retailers, and observer of what end customers actually keep wearing. That advice is free whether or not you place an order.
If you are weighing 300 against 420gsm for an autumn/winter programme, send the tech pack and the target channel.
FAQ
Does a higher GSM mean better quality?
No. GSM measures weight, not quality. A 420gsm and a 300gsm fleece of the same construction differ in drape and hand-feel, not in how well they are made.
Why do two 320gsm fleeces feel different?
Gauge, stitch length and — mostly — brushing level. Ask for the brushing level by name, not just the weight.
Is 420gsm too heavy for retail?
It is a channel decision, not a design one. At 1–1.5kg per unit against 0.6–1kg, the freight and return cost has to be carried by the price point.
How big is the real gap between 300 and 420gsm?
Fabric cost alone can reach around 30%. The total is larger once kilos, re-grading and freight are counted.
Can good brushing replace weight?
Up to a point. It can bring a 300gsm close in hand-feel, but not in drape, because drape comes from mass.