Wool vs Synthetic

Wool vs Synthetic Fibres

Understanding the differences between natural wool and synthetic fibres helps you make informed choices about clothing quality, performance, and environmental impact.

Temperature Regulation

Wool is a natural thermoregulator. Its crimped fibre structure creates tiny air pockets that trap warmth in cold conditions, while its moisture-wicking properties help cool the body in warmth. Wool keeps you comfortable across a wider temperature range than most synthetics.

Synthetic fabrics like polyester and acrylic provide insulation through bulk rather than fibre structure. They tend to overheat in warm conditions because they don't breathe as effectively as wool.

Moisture Management

Wool fibres can absorb up to 30% of their weight in moisture vapour without feeling damp. The moisture is absorbed into the fibre core, keeping the surface dry against your skin. As wool absorbs moisture, it actually generates a small amount of heat through an exothermic reaction — a unique property among textile fibres.

Polyester and nylon are hydrophobic — they don't absorb moisture but can wick it along the fibre surface. This makes them quick-drying but means perspiration sits on the skin rather than being absorbed, which can feel clammy.

Odour Resistance

Wool is naturally antimicrobial. The structure of the keratin protein in wool fibres inhibits bacterial growth — and it's bacteria, not sweat itself, that causes odour. Wool garments can be worn multiple times between washes. Studies have confirmed that wool clothing develops significantly less odour than polyester after identical wearing periods.

Synthetic fabrics, particularly polyester, are prone to retaining odour because bacteria adhere readily to the smooth fibre surface. This is why many synthetic performance fabrics require antimicrobial chemical treatments.

Environmental Impact

Wool is a renewable, biodegradable fibre. Sheep produce a new fleece annually, and wool decomposes naturally in soil within months to years, releasing nutrients. Synthetic fibres are derived from petroleum and can take hundreds of years to break down. Every wash cycle releases microplastic fibres from synthetic clothing into waterways — an estimated 700,000 fibres per wash load.

Durability

Wool fibres can bend up to 20,000 times before breaking, compared to roughly 3,000 times for cotton. This natural elasticity means wool garments hold their shape and resist wrinkles. However, wool is more susceptible to moth damage and requires more careful washing than synthetics.

The Bottom Line

Wool outperforms synthetics in comfort, temperature regulation, odour resistance, and environmental impact. Synthetics have advantages in quick drying, low cost, and ease of care. For garments worn close to the skin or for extended periods, natural wool — particularly merino — is the superior choice.