Fabric GSM Guide: Hoodie GSM Chart & T-Shirt Weights

Fabric Weight GSM Guide: Hoodie GSM Chart & T-Shirts

GSM means grams per square meter. It tells you how much one square meter of fabric weighs, but it does not tell you the total weight of a finished garment or whether one fabric is automatically better than another.

For most everyday hoodies, 280–350 GSM is a practical starting range. A 360 or 380 GSM hoodie moves toward a heavier, more structured feel, while 400–420 GSM is generally used for heavyweight styles. For everyday T-shirts, 180–220 GSM is a useful starting point. A 240 GSM fabric normally feels heavyweight in a T-shirt but relatively light in a hoodie.

These ranges help buyers compare fabrics, but GSM should never be reviewed alone. Fiber content, knit construction, finishing, garment fit and washing can all change how a fabric feels and performs.

What Does GSM Mean in Clothing?

GSM is short for grams per square meter. A fabric supplier measures a controlled area of fabric, weighs it and calculates what one square meter of that fabric would weigh.

For example:

• A 180 GSM fabric weighs 180 grams per square meter.
• A 240 GSM fabric weighs 240 grams per square meter.
• A 380 GSM fabric weighs 380 grams per square meter.

This does not mean a T-shirt made from 240 GSM fabric will weigh exactly 240 grams. The finished garment weight also depends on its size, sleeve length, hood, pockets, rib panels, zippers, trims and seam construction.

The same definition applies to hoodies. When a supplier describes a hoodie as 320 GSM, the number normally refers to its main body fabric. It does not mean the completed hoodie weighs 320 grams, and the rib or lining may have a different GSM.

Within a similar fiber and knit structure, a lower GSM normally feels lighter and less bulky. A higher GSM normally creates more body, coverage and structure. However, lower GSM is not always more breathable, and higher GSM is not always warmer.

A dense 180 GSM synthetic knit, for example, may allow less airflow than a more open 220 GSM cotton knit. Fabric structure still matters.

Hoodie GSM Chart: Fabric Weights Compared

This hoodie GSM chart gives a working reference for conventional French terry and sweatshirt fleece fabrics. It compares common hoodie fabric weights rather than setting fixed industry grades.

The final warmth, thickness and drape still depend on the fabric construction and finish. Two fabrics listed at 320 GSM may feel noticeably different, and GSM cannot be converted directly into thickness in millimeters.

The product category also changes the interpretation. A 240 GSM T-shirt usually feels heavyweight, while a 240 GSM hoodie is a lightweight layer.

What GSM Is Best for Hoodies?

There is no single best GSM for every hoodie. A lightweight travel layer, an everyday retail hoodie and a heavyweight streetwear hoodie need different fabric weights.

For most daily hoodie programs, 280–350 GSM is a practical working range. Brands that want a more structured or heavyweight product can move toward 360–420 GSM or above. The right choice depends on the intended season, fabric structure and how substantial the finished garment should feel.

220–260 GSM: Lightweight Hoodies

A hoodie in this range is designed more for layering than insulation. It can work for transitional weather, travel, indoor use and markets with warmer climates.

At 240 GSM, buyers should not expect the substantial feel associated with heavyweight fleece. The hood also needs attention. Its size, lining and construction should be tested in a complete garment rather than approved from a fabric swatch alone.

Is 280 GSM Good for a Hoodie?

Yes. A 280 GSM hoodie can work well for everyday wear and layering when the product should feel lighter and less bulky. For conventional sweatshirt fabrics, it generally sits around the light-to-midweight range.

It may feel too light if the brand wants a dense heavyweight streetwear hoodie. That does not make 280 GSM poor quality; it means the weight should match the product position.

A brushed 280 GSM fleece and an unbrushed 280 GSM French terry may also feel different. Check the inner surface and finished sample before deciding whether the fabric suits the season.

Is 320 GSM Good for a Hoodie?

Yes. A 320 GSM hoodie usually offers a balanced midweight feel with enough structure for many everyday retail programs. It is a useful starting point when a brand wants more body than a lightweight layer without excessive bulk.

The season still depends on the construction. A 320 GSM brushed fleece may feel warmer than a 320 GSM French terry because the brushed inner surface traps more air.

If the target is a more substantial daily hoodie, moving toward 350 GSM can add body within a comparable fabric construction. Check whether the hood, kangaroo pocket and rib panels remain balanced with the main fabric.

Is 360 GSM Good for a Hoodie?

Yes. A 360 GSM hoodie can suit a brand that wants a substantial casual layer with more structure than a typical lighter daily hoodie.

360 GSM means the fabric weighs 360 grams per square meter. In conventional fleece or French terry, it sits toward the heavier end of everyday hoodie weights and may be described as heavyweight. Suppliers do not all use the same category boundaries.

For a colder-season casual product or structured streetwear style, this can be a useful weight to sample. For warm climates or active use, buyers should check whether the extra bulk is appropriate.

Compared with a similar 320 GSM fabric, 360 GSM will generally add body. It does not automatically improve softness, warmth or durability.

Is 380 GSM Good for a Hoodie?

Yes, if the product is intended to feel heavyweight. A 380 GSM hoodie generally has a substantial, structured feel when made from conventional sweatshirt fleece or French terry.

380 GSM means one square meter of the fabric weighs 380 grams. It does not describe the exact thickness of the fabric or the weight of the finished hoodie.

This weight can work well for premium streetwear and cold-weather casualwear. It may be excessive for warm climates or lightweight layering. It also affects seam bulk, packing weight and garment balance, so the decision should be made during sampling rather than after bulk fabric has been booked.

400–500 GSM: Heavyweight Hoodies

Fabric at 400 GSM and above is generally used when weight and structure are central parts of the product concept.

A 400 GSM fabric weighs 400 grams per square meter. A 420 GSM hoodie is considered heavyweight in most conventional sweatshirt programs. It can deliver a dense, substantial feel, but the additional GSM must be supported by stable knitting, controlled shrinkage and suitable rib construction.

Moving toward 450–500 GSM makes the product more specialized. Buyers should confirm that the hood, seams and fit remain comfortable in the intended use.

For a performance or golf hoodie, GSM should be reviewed together with stretch recovery, moisture management and wash durability. These properties need their own checks during fabric development.

320 vs 380 GSM Hoodie: Which Should a Brand Choose?

For comparable fabrics, start with 320 GSM when the product needs an everyday midweight feel and easier layering. Test 380 GSM when a heavier, more structured feel is part of the product concept.

The most useful comparison is between samples with similar fiber content, knit construction and finishing. Comparing 320 GSM brushed fleece with 380 GSM unbrushed French terry changes more than the weight, so the hand-feel difference cannot be attributed to GSM alone.

What Is a Good GSM for T-Shirts?

For most T-shirt programs, the useful range starts at around 150 GSM and extends to approximately 260 GSM. The right choice depends on the intended fit, selling season, color, price position and customer expectations.

150–180 GSM: Lightweight T-Shirts

This range works for summer basics, promotional shirts, event apparel and products designed for warm conditions.

The fabric can feel light and comfortable, but brands should check opacity, especially in white and pale colors. A low GSM does not automatically mean poor quality. The yarn, knitting and finishing still need to be consistent.

180–220 GSM: Everyday T-Shirts

This is a practical range for regular retail T-shirts. It offers a useful balance between comfort, coverage and everyday wear.

Around 180 GSM tends to feel lighter and more flexible, while 200–220 GSM gives the garment a little more body. For many brands, this is a sensible starting range before moving to an extremely light or obviously heavyweight fabric.

230–260 GSM: Heavyweight T-Shirts

This range is common in structured basics, premium casualwear and oversized streetwear T-shirts.

A 240 GSM T-shirt usually feels substantial rather than light. It can hold a boxy silhouette well and may provide better coverage, but the pattern still needs to account for the reduced drape and additional bulk.

Once the fabric moves toward 260 GSM, neckline rib, shoulder shape and overall garment balance become increasingly important. Simply using heavier fabric does not guarantee that the finished T-shirt will look premium.

Is 240 GSM Thick for a T-Shirt?

Yes. In most T-shirt applications, 240 GSM is considered heavyweight.

It is a good option when the target product needs more structure, opacity and a substantial hand feel. It may be less suitable for a lightweight summer shirt or a product intended for high-output exercise.

Brands should also confirm the actual knit and finish. A compact 240 GSM jersey may feel smoother and denser than a softer fabric at the same listed weight.

Typical GSM for French Terry Streetwear Vests

For French terry streetwear vests and sleeveless hoodies, 280–320 GSM is a useful starting range. Lightweight layering styles may use 220–260 GSM, while a more structured product may move toward 320–380 GSM.

These are references for knitted French terry layers, rather than insulated, quilted or woven wind-resistant golf vests. Those products need separate specifications for the shell, lining and any insulation.

Traditional French terry has a smooth face and a looped back. Some suppliers use terms such as brushed French terry for fabrics with a modified reverse surface. Check the actual swatch and finished garment rather than relying only on the commercial name.

Why Fabrics With the Same GSM Can Feel Different

A 240 GSM cotton jersey, 240 GSM polyester interlock and 240 GSM French terry will not feel or perform the same way. Even two cotton fabrics at the same GSM can differ significantly.

Several factors explain the difference.

Fiber Content

Cotton, polyester, recycled polyester and blended fabrics carry moisture, recover from stretching and respond to finishing differently.

GSM and fabric composition describe different properties. Confirm both specifications when comparing samples.

For cotton T-shirts, yarn count also affects surface fineness and hand feel, even when two fabrics have a similar GSM. A yarn count such as 40s is not a fabric-weight measurement.

Knit Construction

Jersey, interlock, piqué, French terry and fleece use different structures. The way the yarn is arranged affects thickness, stretch, airflow, surface appearance and stability.

That is why a compact jersey can feel thin but dense, while a loop-back French terry may feel bulkier at a similar GSM.

Surface Finishing

Brushing, peaching, enzyme washing, silicone softening and garment washing can change the perceived softness and fullness of a fabric.

Some finishes can also influence shrinkage or dimensional stability. A soft first sample is not enough; the hand feel should remain acceptable after the agreed washing process.

Fit and Garment Construction

Oversized patterns often need enough fabric body to hold their silhouette. A close-fitting garment may need more drape, recovery or stretch.

Hoods, pockets, zippers, linings and rib panels also change how the finished garment feels. The correct fabric cannot be chosen by reviewing a GSM number without considering the pattern.

Does Higher GSM Mean Better Quality?

No. Higher GSM means more fabric mass per square meter, not automatically better yarn, knitting or finishing.

Within a comparable fabric construction, higher GSM can add coverage, body and structure. It can also add bulk and packing weight, and may be less suitable for warm-weather products.

Quality should be judged through a combination of yarn consistency, fabric stability, shrinkage, colorfastness, surface appearance and garment workmanship. A stable, well-finished 320 GSM fabric may be a better choice than an inconsistent 420 GSM fabric.

The goal is to select the weight that fits the intended product and can be reproduced consistently in bulk.

How to Convert GSM to oz/yd²

Some fabric suppliers list weight in ounces per square yard rather than GSM. To compare the two units:

• oz/yd² ≈ GSM ÷ 33.906
• GSM ≈ oz/yd² × 33.906

For example, 320 GSM is approximately 9.44 oz/yd², while 380 GSM is approximately 11.21 oz/yd².

These figures describe fabric weight per unit area. A 9.44 oz/yd² fabric does not mean the completed hoodie weighs 9.44 ounces. If a supplier lists only “oz,” confirm whether it means fabric weight per square yard or the weight of a finished garment.

How Brands Should Choose the Right GSM

Start with the way the garment is expected to be worn.

A summer T-shirt and a heavyweight streetwear T-shirt may share the same basic shape, but they solve different customer needs. The same is true for a lightweight layering hoodie and a 420 GSM winter hoodie.

Before confirming the fabric, define:

• Product category and intended season
• Target market and climate
• Regular, slim, relaxed or oversized fit
• Desired softness, structure and drape
• Required opacity
• Printing or embroidery method
• Retail price and shipping considerations

A physical reference sample is especially useful. Terms such as lightweight, midweight and heavyweight are interpreted differently by different suppliers and brands. A reference garment gives the development team a clearer standard than a description alone.

Review a complete garment as well as the fabric swatch. A fabric can feel suitable in the hand but behave differently once the hood, pocket, rib and decoration are added.

If the product is a crewneck, review the separate guide to midweight and heavyweight crewneck sweatshirts for product-specific weight and construction checks.

How to Confirm GSM Before Bulk Production

The target GSM should be written into the fabric specification or tech pack, together with an agreed tolerance. Avoid approving a fabric only because the supplier calls it “heavyweight” or “premium.”

During sampling, confirm both the reported GSM and the finished garment hand feel. Fabric moisture and test conditions can affect measurement, so samples should be evaluated under consistent conditions.

For a recognized test reference, ASTM D3776/D3776M covers mass-per-unit-area measurement for most fabrics and includes different sampling options. Agree on the appropriate method and sample conditions with the supplier or testing laboratory.

For bulk production, GSM should be checked across more than one fabric roll and more than one position, according to the agreed sampling plan. Testing a single small piece may not reveal variation across the shipment.

Brands should also review:

• Whether the reported GSM refers to fabric before or after the agreed finishing process
• GSM and dimensional changes after the agreed washing process
• Color-to-color weight differences where relevant
• Whether bulk fabric matches the approved sample in weight, surface appearance and hand feel
• Whether rib, pocketing and secondary fabrics remain balanced with the main fabric

Remember that GSM is fabric weight, not finished garment weight. If shipping or packed carton weight matters, weigh the completed garments separately.

GSM inspection should sit inside a broader apparel quality control checklist covering measurements, workmanship, color consistency, packing and final inspection.

Frequently Asked Questions

Is 240 GSM Thick?

It depends on the garment. A 240 GSM fabric is normally heavyweight for a T-shirt but lightweight for a conventional hoodie or French terry layer. GSM measures mass per area, so it does not specify exact thickness.

Is a 280 GSM Hoodie Good or Bad?

A 280 GSM hoodie can be a good choice for everyday wear and layering. It may feel too light for a heavyweight streetwear product. Judge it against the intended use, fabric construction and finished sample rather than treating 280 GSM as a quality grade.

Is 320 GSM Heavy for a Hoodie?

For conventional sweatshirt fleece or French terry, 320 GSM is usually treated as midweight. It can feel substantial, but it is generally lighter than a comparable 380–420 GSM fabric. Supplier classifications vary.

What Is the Difference Between 360 and 380 GSM?

A 380 GSM fabric has 20 grams more mass per square meter than a 360 GSM fabric, or about 5.6% more. With similar construction and finishing, it may feel slightly heavier. The numbers alone cannot tell you how much warmer, thicker or softer it will be.

Is 420 GSM Good for Hoodies?

Yes, when the target is a heavyweight hoodie. A 420 GSM fabric can work for structured streetwear and substantial cold-weather casual layers. Check seam bulk, shrinkage, hood balance and comfort before confirming it for production.

Does Washing Change GSM?

It can. If a fabric shrinks, its mass is distributed over a smaller area, which can increase the measured GSM. Changes from finishing or fiber loss can also affect the result. Compare samples under consistent conditions and record whether the specification applies before or after washing.

Choosing a Fabric Weight You Can Reproduce

For everyday T-shirts, 180–220 GSM is a useful starting range, while 240 GSM moves into heavyweight territory. For conventional hoodies, 280–350 GSM covers many daily styles, and 360–420 GSM offers a heavier, more structured direction.

Before ordering bulk fabric, confirm the weight through a finished sample. Record the composition, construction, finish and washing conditions alongside the GSM so the production team has a clear reference to reproduce.

If you are developing custom T-shirts, hoodies or French terry layers, prepare the target GSM, fit reference, finishing requirements and expected order quantity before requesting a sample. For golf-focused OEM programs, review our custom golf hoodie manufacturing options for fabric selection, sampling and bulk production.