Polyester has dominated the activewear market for three decades. It's cheap to produce, durable, stretchy, and excellent at wicking moisture. Walk into any mainstream sportswear brand and the majority of what you'll find is polyester — often labelled as "performance fabric" or given a proprietary technical name.

But polyester has problems that are hard to solve. And Lyocell — still a relative newcomer to performance apparel — addresses most of them. Here's an honest comparison.

Where Each Fabric Comes From

Polyester

Polyester is a synthetic polymer — essentially plastic in fibre form. It's derived from petroleum, the same source as the plastic in water bottles and packaging. The manufacturing process is energy-intensive and produces the fibre from non-renewable fossil resources. Polyester does not biodegrade. Once a polyester garment reaches end-of-life, the plastic it contains will persist in the environment for hundreds of years.

Lyocell (TENCEL™)

Lyocell is made from wood pulp — typically from fast-growing eucalyptus, beech, or pine trees cultivated on certified sustainable plantations. The wood pulp is dissolved and reformed into fibres using a closed-loop production process that recycles up to 99.5% of the solvents used. Lyocell is biodegradable. At end-of-life, it breaks down naturally rather than persisting as microplastic pollution.

Performance Comparison

Moisture Management

Polyester is hydrophobic — it repels water. This is why it wicks moisture away from the skin rapidly: sweat can't soak into the fibre, so it moves to the surface and evaporates. For high-intensity exercise, this wicking action keeps you feeling dry. The downside is that moisture is rapidly moved to the outer surface, which some people find creates a cold, damp sensation as the fabric saturates.

Lyocell is hydrophilic — it absorbs moisture. Rather than simply pushing sweat to the outer surface, Lyocell distributes moisture through the fibre, evening it out across a larger surface area for more gradual evaporation. The effect during exercise is more of a consistent, gentle moisture regulation than the rapid wicking of polyester. For moderate-intensity exercise — yoga, gym sessions, running at moderate pace — Lyocell manages moisture very effectively. At extreme exertion levels (elite endurance sport), high-performance polyester has an edge in raw wicking speed.

Odour Resistance

This is where the comparison becomes decisive for most people.

Polyester is notoriously prone to odour retention. The rough, pitted microscopic surface of synthetic fibres provides ideal conditions for bacteria to embed and colonise. Standard laundry detergent can't fully penetrate deep into synthetic fibres — particularly at the lower wash temperatures recommended for the fabric — meaning bacteria survive washing and reactivate immediately when you start sweating again. Many people with polyester-heavy wardrobes report the same shirts smelling within minutes of a workout even when freshly washed.

Lyocell has a naturally smooth fibre structure that doesn't provide the same bacterial harbour. It's not odour-proof — no fabric is — but its bacterial retention is significantly lower than polyester. Lyocell's moisture absorption also means sweat doesn't pool on the fabric surface in the same way, reducing the humid microenvironment bacteria need to thrive.

Feel Against Skin

Polyester can feel synthetic and rough against skin, particularly lower-grade polyester. Some people experience irritation, especially during prolonged wear or in heat. Performance polyester has improved significantly — high-end versions are much softer — but there's a fundamental limit to how soft a plastic fibre can feel.

Lyocell fibres are naturally smooth and round. Most people describe the feel as similar to high-quality silk or very fine cotton — significantly softer than any polyester. For people with sensitive skin, this is often the decisive factor: Lyocell simply doesn't irritate in the way synthetic fibres can.

Durability

Polyester is highly durable under mechanical stress — it's difficult to tear, holds its shape well, and tolerates high wash temperatures. For applications with extreme mechanical demands (cycling shorts, high-compression running tights), polyester and its blends remain the go-to.

Lyocell has historically had a reputation for lower durability, particularly pilling. Modern high-tenacity Lyocell has substantially improved on this. With correct care — washing at 30°C, gentle cycle, air drying — Lyocell activewear performs well through regular training use. The reduced washing frequency enabled by Lyocell's odour resistance also means fewer wash cycles overall, which extends garment life.

Environmental Impact

This is where the gap between the fabrics is largest.

The microplastic point deserves emphasis. According to ADEME (the French Agency for Ecological Transition), a single wash of synthetic fabric can release hundreds of thousands of microplastic particles. These pass through most wastewater treatment systems and enter aquatic environments, where they're now found throughout the food chain — including in human tissue. Switching from polyester to Lyocell activewear eliminates this source of microplastic pollution entirely.

The Verdict

• For elite endurance performance (marathon, triathlon, maximum-intensity sport): High-performance polyester still has an edge in raw moisture wicking speed. Performance at the highest levels may favour synthetics.
• For gym, yoga, running, and everyday training: Lyocell matches or outperforms polyester on every metric that matters to most people — comfort, odour resistance, skin feel, and environmental footprint.
• For the environment: Lyocell wins clearly — from production through to end-of-life biodegradation and zero microplastic shedding.
• For people with sensitive skin: Lyocell is significantly better.
• For people who hate doing laundry: Lyocell wins — you wash it less often.

Polyester's dominance in sportswear was built on cost and manufacturing scalability, not on being the best fabric for the people wearing it. As Lyocell production has scaled and performance has improved, the case for choosing it over polyester becomes harder to argue against.

How APRÍ Uses Lyocell

APRÍ builds on TENCEL™ Lyocell as the fabric foundation across the collection, adding plant-based anti-odour treatments (APRÍtech™ with HeiQ Mint or APRÍshield™ with NordShield) that work in combination with Lyocell's natural properties to maximise freshness across multiple wears.

The result is activewear that's genuinely more comfortable, smells less, and is better for the environment — not as a compromise on performance, but as an upgrade on the standard.