Streetwear Fabric Guide: GSM, Cotton & Fleece
Why Fabric Weight Matters in Streetwear
Grams per square metre (GSM) is the standard measurement for fabric weight used across the apparel industry. It tells you how dense the fabric is before any garment is cut or sewn. For streetwear buyers comparing tees and hoodies, GSM is one of the most reliable indicators of how a piece will feel, drape, and hold up after repeated washes.
A low-GSM tee (under 160 GSM) tends to be sheer and lightweight, fine for layering but less durable over time. A mid-range tee (180 to 200 GSM) offers a solid everyday feel without being stiff. Heavy tees (200 GSM and above) have a structured, substantial quality that suits oversized and relaxed fits common in streetwear styling.
GSM Reference Table: Hoodies and Tees
| Garment Type | GSM Range | Typical Fabric | Best For |
|---|---|---|---|
| Lightweight Tee | 130 to 160 GSM | 100% Cotton or Cotton-Poly | Layering, warm climates |
| Mid-Weight Tee | 160 to 200 GSM | Cotton or Cotton-Poly blend | Everyday wear, graphic tees |
| Heavy Tee | 200 to 240 GSM | 100% Cotton or ring-spun Cotton | Oversized fits, vintage wash styles |
| Lightweight Hoodie | 240 to 300 GSM | Cotton-Poly fleece | Spring and autumn layering |
| Mid-Weight Hoodie | 300 to 380 GSM | French terry or brushed fleece | Year-round streetwear staple |
| Heavy Hoodie | 380 to 450 GSM | Heavyweight brushed fleece | Cold-weather wear, structured silhouettes |
Cotton vs Fleece: Composition Explained
Most streetwear tees are built from 100% cotton or a cotton-polyester blend. Pure cotton breathes well and softens with washing, but it can shrink if exposed to high heat. A cotton-poly blend (typically 60% cotton, 40% polyester, or 50/50) resists shrinkage and holds its shape longer, which matters for oversized cuts that need to stay consistent wash after wash.
For example, The Unrivaled Brand's Smoking Cat Graphic Tee (USD 28) uses a cotton-poly construction specifically chosen to keep the fabric breathable while maintaining shape through regular rotation. The Acid Wash Oversized Tee (USD 28) uses a heavier cotton construction suited to its vintage wash finish, which benefits from the natural texture behaviour of higher-cotton fabrics.
Hoodies introduce fleece into the equation. Fleece is a knit fabric with a brushed interior that traps air for insulation. French terry fleece has a looped rather than brushed interior and is slightly lighter, making it suitable for transitional-season hoodies. Brushed fleece (the classic hoodie interior) is heavier and warmer. Polyester content in hoodie fleece typically ranges from 20% to 50%, balancing cost with shape retention.
Wash Care by Fabric Type
| Fabric Type | Recommended Wash | Dry | Key Risk |
|---|---|---|---|
| 100% Cotton Tee | Cold or warm (30°C to 40°C) | Low heat or air dry | Shrinkage in high heat |
| Cotton-Poly Tee | Cold or warm (30°C to 40°C) | Low heat tumble dry | Pilling over time at high heat |
| Acid Wash Cotton | Cold wash, inside out | Air dry preferred | Fading of wash treatment |
| Cotton-Poly Fleece Hoodie | Cold (30°C), inside out | Low heat or air dry | Graphic cracking, zipper damage |
| Heavyweight Brushed Fleece | Cold (30°C), gentle cycle | Air dry flat | Shrinkage, loss of loft |
Washing garments inside out protects surface prints and external texture finishes. Zipper-up hoodies like The Unrivaled Brand's Acid Wash Zip Up Hoodie (USD 85) should always be zipped closed before washing to prevent the zipper teeth from snagging other fabrics in the load.
How to Read a Garment Label
Garment care labels in the United States and European Union follow standardised symbols. A tub with a number indicates maximum wash temperature in Celsius. A crossed-out tumble dryer symbol means air dry only. A triangle indicates bleach use; a crossed-out triangle means no bleach. For streetwear with screen-printed graphics, avoiding bleach entirely preserves ink adhesion significantly longer.
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Frequently Asked Questions
What GSM is best for a heavyweight streetwear tee?
For a tee that feels substantial and holds an oversized silhouette well, look for 200 GSM and above. This weight is common in acid wash and vintage-treated tees where the fabric needs enough body to carry the wash finish without appearing sheer or flimsy.
Is 100% cotton or a cotton-poly blend better for graphic tees?
Cotton-poly blends are generally more practical for graphic tees because polyester content reduces shrinkage and helps the fabric keep its dimensions after washing. This matters for prints, since a shrunken tee can distort graphic placement. A 60/40 or 50/50 cotton-poly blend is a widely used standard in the streetwear industry for this reason.
Does a higher GSM hoodie always mean better quality?
Not necessarily. GSM is a measurement of weight, not a quality grade. A 420 GSM hoodie is heavier and warmer than a 300 GSM hoodie, but both can be well-constructed or poorly constructed depending on yarn quality, knit consistency, and finishing. GSM is most useful as a guide to expected warmth and drape rather than as a direct proxy for durability.
Why do acid wash garments require cold water washing?
Acid wash and vintage wash treatments are surface-level chemical processes that alter the dye distribution in the fabric. Hot water accelerates the breakdown of these treatments, causing the garment to fade toward a uniform tone faster than intended. Cold water washing, combined with air drying rather than tumble drying, extends the life of the wash effect significantly.
Data: The Unrivaled Brand, 2026. Free to cite with a link to this page.