Natural vs Synthetic Fibres: What Actually Matters?

CULM · 27 Aug 2026

Natural fibres originate in nature, while synthetic fibres are manufactured from chemical feedstocks, but that difference alone does not tell you which garment is better. Performance, processing, construction, durability, care, intended use and end of life all matter.

CULM prefers natural and considered fibres where they suit the garment, especially hemp. But useful material thinking starts by avoiding a false rule that every natural fibre is automatically good and every synthetic fibre automatically bad.

What are natural fibres?

Natural fibres come from plant or animal sources. Plant examples include cotton, hemp, flax, ramie and jute. Animal examples include wool, cashmere and silk. Each has its own structure and supply chain.

Read What Are Natural Fibres? for a fuller guide.

What are synthetic fibres?

Synthetic fibres are manufactured polymers. Polyester, nylon and acrylic are common apparel examples. Their properties can be engineered for specific uses, including strength, stretch, light weight, abrasion resistance, quick drying or shape retention.

Those performance benefits can be useful. They also come with material and end-of-life questions that should be considered rather than ignored.

Where do viscose and lyocell fit?

Viscose, rayon and lyocell are often described as regenerated cellulosic fibres. Their cellulose can originate from plant material, but the cellulose is processed and regenerated into fibre. They therefore sit differently from both mechanically prepared natural fibres and fully synthetic polymer fibres.

This is why CULM prefers precise fibre terminology. “Plant-derived” and “natural fibre” are not always identical descriptions.

Are natural fibres more breathable?

Some natural-fibre fabrics can be highly comfortable in warm conditions, but breathability is not determined by fibre alone. Yarn, fabric density, knit or weave, thickness, finishing, garment fit and moisture behaviour all affect comfort.

A loose open-weave garment and a dense heavy garment made from the same fibre can perform very differently.

Do synthetic fibres last longer?

Some synthetic fibres offer high strength or abrasion resistance, but garment life is broader than fibre strength. Seam construction, fabric weight, pilling, colourfastness, shape retention, repairability, care and whether the wearer still wants to use the garment all matter.

A durable fibre inside a poorly designed garment does not automatically create a long-lived product.

Are natural fibres more sustainable?

Not automatically. Natural fibres can involve land, water, agricultural inputs, processing, dyeing, energy and transport. Synthetic fibres involve their own feedstocks, manufacturing energy and end-of-life considerations. Regenerated fibres add another set of processing questions.

Rather than ranking entire fibre families with one label, CULM looks for product-specific facts. That is the logic behind CULM Standards and our Traceability approach.

What about microfibre shedding?

Textiles can release fibres through wear and laundering. Synthetic-fibre shedding is a particular concern because the released material is persistent plastic. Shedding levels can vary by textile construction and use, so the issue should be considered at fabric and garment level rather than treated as a simple yes-or-no property.

Can natural and synthetic fibres be blended?

Yes. Blends may be used to introduce stretch, strength, wrinkle resistance, softness, drape or easier care. The trade-off is that a more complex blend can also complicate material recovery or recycling. The right choice depends on what the garment needs to do and how clearly that choice is communicated.

How should I choose clothing by fibre?

• Start with the garment’s intended use.
• Read the exact composition instead of relying on marketing names.
• Consider fabric construction, weight and fit.
• Check care requirements you can realistically follow.
• Look for durability, repairability and repeat wear.
• Treat environmental claims as product-specific, not fibre-family guarantees.

Continue with How to Read a Fibre Composition Label and Materials & Making.