Thread Report · 76 products analyzed · Updated June 13, 2026
What is Sézane made of?
Better than most. Sézane averages 90.7% natural fibre, which puts them ahead of many competitors. But not everything is equal.
Prefer the plain-English version? Read our Sézanebuyer's guide →
According to Fibr's Thread Report (June 2026), 1.3% of Sézane's 76 analysed products are majority-synthetic, with an average natural-fibre content of 90.7%.
76.3% of Sézane products are nearly all-natural (95%+). That's genuinely good — better than most fast fashion retailers.
The full picture on Sézane.
Sézane is one of the stronger performers in our dataset, averaging 90.7% natural fibre across 76 products we analyzed. Only 1.3% of products are polyester-heavy — relatively low compared to many retailers. On the bright side, 76.3% of Sézane products are made almost entirely from natural fibres (95%+). The most common fibre across Sézane products is Cotton, appearing in 78.9% of items.
How Products Break Down
- 18.4%
Blend
30–85% natural fibre · 14 products
- 81.6%
Natural
85–100% natural fibre · 62 products
Most Common Fibres (% of products containing)
Where to buy (and avoid).
Not all categories at Sézaneare equal. Here's where the natural fibres are.
Safe Zones · 70%+ natural
What we found.
Across 76 products analyzed, Sézane averages 90.7% natural fibre content.
1.3% of Sézane products are majority polyester — that's 1 items made mostly from plastic.
Sézane t-shirts are their strongest category at 96.3% natural fibre (9 products).
Their weakest category: shirts at just 95.3% natural (32 products).
Only 76.3% of products (58 items) are 95%+ natural fibre.
| Category | Products | Avg Natural % |
|---|---|---|
| T-Shirt | 9 | 96.3% |
| Shirt | 32 | 95.3% |
Sample Products
A selection of Sézane products from our database — from most natural to most synthetic. Click to view on the retailer's site.
The verdict.
Sézane is one of the better options for natural fabrics. With 76.3% of products being nearly all-natural, you have real choices here. Still — always check the label. Not every item is created equal.
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Frequently asked questions.
What is Sézane clothing made of?
Based on our analysis of 76 Sézane products, the average garment is 90.7% natural fibre. The most common single fibre is Cotton (in 78.9% of products). The remaining material is typically synthetic — polyester, polyamide, or acrylic.
Is Sézane cotton?
Sometimes — cotton appears in 78.9% of the 76 Sézane products we analyzed, but it's usually blended with synthetics. Only 76.3% of items are nearly all-natural (95%+ natural fibre), so check the composition before assuming a piece is pure cotton.
Is Sézane 100% cotton?
Some pieces are. Of the 76 Sézane products we analyzed, 44 are 100% cotton (or near-pure, 95%+) — that's 57.9% of the catalog. The rest are blends.
How much polyester does Sézane use?
1.3% of Sézane products are polyester-heavy, meaning polyester makes up 50% or more of the garment. This is below average for fast fashion retailers.
Is Sézane mostly synthetic?
1.3% of Sézane products are polyester-heavy (50%+ polyester). Average natural fibre content is 90.7%, so the rest of the catalog is mostly natural-led.
Does Sézane use natural fabrics?
76.3% of Sézane products are nearly all-natural (95%+ natural fibre). A decent portion of their range avoids synthetic fibres entirely.
Is Sézane sustainable in terms of fabric?
Fabric composition is one factor in sustainability. With an average of 90.7% natural fibre, Sézane is better than many competitors 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/sezane.json ↓
- Computed stats (JSON)
- /api/thread-report/sezane
Suggested citation
Fibr Thread Report — Sézane, 2026-06-13. tryfibr.app/thread-report/sezane
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