Thread Report · 50 products analyzed · Updated June 13, 2026
What is Whistles made of?
Better than most. Whistles averages 87.1% natural fibre, which puts them ahead of many competitors. But not everything is equal.
According to Fibr's Thread Report (June 2026), 0% of Whistles's 50 analysed products are majority-synthetic, with an average natural-fibre content of 87.1%.
The full picture on Whistles.
Whistles is one of the stronger performers in our dataset, averaging 87.1% natural fibre across 50 products we analyzed. Only 0% of products are polyester-heavy — relatively low compared to many retailers. On the bright side, 66% of Whistles products are made almost entirely from natural fibres (95%+). The most common fibre across Whistles products is Cotton, appearing in 50% of items.
How Products Break Down
- 34%
Blend
30–85% natural fibre · 17 products
- 66%
Natural
85–100% natural fibre · 33 products
Most Common Fibres (% of products containing)
Where to buy (and avoid).
Not all categories at Whistlesare equal. Here's where the natural fibres are.
Safe Zones · 70%+ natural
What we found.
Across 50 products analyzed, Whistles averages 87.1% natural fibre content.
Only 66% of products (33 items) are 95%+ natural fibre.
Cotton is the single most common fibre, appearing in 50% of all Whistles products.
| Category | Products | Avg Natural % |
|---|---|---|
| Jeans | 6 | 93.9% |
Sample Products
A selection of Whistles products from our database — from most natural to most synthetic. Click to view on the retailer's site.
The verdict.
Whistles is one of the better options for natural fabrics. With 66% 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 Whistles clothing made of?
Based on our analysis of 50 Whistles products, the average garment is 87.1% natural fibre. The most common single fibre is Cotton (in 50% of products). The remaining material is typically synthetic — polyester, polyamide, or acrylic.
Is Whistles cotton?
Sometimes — cotton appears in 50% of the 50 Whistles products we analyzed, but it's usually blended with synthetics. Only 66% of items are nearly all-natural (95%+ natural fibre), so check the composition before assuming a piece is pure cotton.
Is Whistles 100% cotton?
Some pieces are. Of the 50 Whistles products we analyzed, 16 are 100% cotton (or near-pure, 95%+) — that's 32.0% of the catalog. The rest are blends.
How much polyester does Whistles use?
0% of Whistles products are polyester-heavy, meaning polyester makes up 50% or more of the garment. This is below average for fast fashion retailers.
Is Whistles mostly synthetic?
0% of Whistles products are polyester-heavy (50%+ polyester). Average natural fibre content is 87.1%, so the rest of the catalog is mostly natural-led.
Does Whistles use natural fabrics?
66% of Whistles products are nearly all-natural (95%+ natural fibre). A decent portion of their range avoids synthetic fibres entirely.
Is Whistles sustainable in terms of fabric?
Fabric composition is one factor in sustainability. With an average of 87.1% natural fibre, Whistles 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/whistles.json ↓
- Computed stats (JSON)
- /api/thread-report/whistles
Suggested citation
Fibr Thread Report — Whistles, 2026-06-13. tryfibr.app/thread-report/whistles
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