Thread Report · 11,023 products analyzed · Updated July 5, 2026
What is ASOS made of?
Short answer: mostly plastic. ASOS relies heavily on synthetic fibres — 46.1% of their products are majority polyester. Here's the full breakdown.
Prefer the plain-English version? Read our ASOSbuyer's guide →
According to Fibr's Thread Report (July 2026), 46.1% of ASOS's 11,023 analysed products are majority-synthetic, with an average natural-fibre content of 37.1%.
ASOS's jeanss are 89.9% natural fibre, but their blazers are just 15.5%. That's a 74-point gap — where you shop within ASOS matters as much as whether you shop there at all.
The full picture on ASOS.
ASOS leans heavily synthetic. Across 11,023 products, only 37.1% of fibre content on average is natural. 46.1% of their products are polyester-heavy (50%+ polyester) — that means nearly half of what they sell is mostly plastic. 27.2% of products are nearly all-natural (95%+ natural fibre). The most common fibre across ASOS products is Polyester, appearing in 52.5% of items.
How Products Break Down
- 55.3%
Synthetic
<30% natural fibre · 6,096 products
- 16.6%
Blend
30–85% natural fibre · 1,830 products
- 28%
Natural
85–100% natural fibre · 3,086 products
Most Common Fibres (% of products containing)
Where to buy (and avoid).
Not all categories at ASOSare equal. Here's where the natural fibres are.
Safe Zones · 70%+ natural
Mixed Bag · 40–70% natural
What we found.
Across 11,023 products analyzed, ASOS averages 37.1% natural fibre content.
46.1% of ASOS products are majority polyester — that's 5,082 items made mostly from plastic.
ASOS jeanss are their strongest category at 89.9% natural fibre (508 products).
Their weakest category: blazers at just 15.5% natural (119 products).
Only 27.2% of products (2,998 items) are 95%+ natural fibre.
| Category | Products | Avg Natural % |
|---|---|---|
| Jeans | 508 | 89.9% |
| T-Shirt | 646 | 73.2% |
| Shirt | 301 | 71.3% |
| Hoodie | 25 | 69.2% |
| Shorts | 347 | 56.7% |
| Pants | 378 | 44.5% |
| Jacket | 132 | 38.3% |
| Sweater | 91 | 36.5% |
| Coat | 88 | 35.9% |
| Skirt | 851 | 33.9% |
| Dress | 4116 | 26.2% |
| Blazer | 119 | 15.5% |
Sample Products
A selection of ASOS products from our database — from most natural to most synthetic. Click to view on the retailer's site.
The verdict.
ASOS is a tough sell if you care about natural fabrics. With 46.1% of products being polyester-heavy, most of what they sell is effectively plastic clothing. If you do shop here, be very selective and always check the composition.
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Frequently asked questions.
What is ASOS clothing made of?
Based on our analysis of 11,023 ASOS products, the average garment is 37.1% natural fibre. The most common single fibre is Polyester (in 52.5% of products). The remaining material is typically synthetic — polyester, polyamide, or acrylic.
Is ASOS cotton?
Sometimes — cotton appears in 35.1% of the 11,023 ASOS products we analyzed, but it's usually blended with synthetics. Only 27.2% of items are nearly all-natural (95%+ natural fibre), so check the composition before assuming a piece is pure cotton.
Is ASOS 100% cotton?
Some pieces are. Of the 11,023 ASOS products we analyzed, 2748 are 100% cotton (or near-pure, 95%+) — that's 24.9% of the catalog. The rest are blends.
How much polyester does ASOS use?
46.1% of ASOS products are polyester-heavy, meaning polyester makes up 50% or more of the garment. This is above average for fast fashion retailers.
Is ASOS mostly synthetic?
46.1% of ASOS products are polyester-heavy (50%+ polyester). Average natural fibre content is 37.1%, so the rest of the catalog is still leaning synthetic in most cases.
Does ASOS use natural fabrics?
27.2% of ASOS products are nearly all-natural (95%+ natural fibre). Only a small fraction of their range avoids synthetic fibres entirely.
Is ASOS sustainable in terms of fabric?
Fabric composition is one factor in sustainability. With an average of 37.1% natural fibre, ASOS is below average on this measure. Natural fibres generally biodegrade and shed fewer microplastics than synthetics.
Use this data.
The Thread Report is openly licensed. Cite it, download it, query it directly — just link back to the source page.
- Last updated
- Raw dataset (JSON)
- info.tryfibr.app/asos.json ↓
- Computed stats (JSON)
- /api/thread-report/asos
Suggested citation
Fibr Thread Report — ASOS, 2026-07-05. tryfibr.app/thread-report/asos
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