Short answer: no. Lyocell is not a plastic. It's not polyester. And it's not synthetic. It's a wood-based fibre made from dissolved wood pulp — specifically eucalyptus, beech, or oak — and it has almost nothing in common with the petroleum-derived fabrics that dominate most sportswear.

Here's a clear answer to the most common questions about what lyocell actually is.

Is lyocell a plastic?

No. Plastics are synthetic polymers derived from petroleum — materials like polyester, nylon, and acrylic. Lyocell is a cellulosic fibre, meaning it comes from plant matter: dissolved wood pulp, processed into fibres using a closed-loop solvent system that recovers and reuses over 99% of the chemicals involved.

Unlike polyester, lyocell is biodegradable. When it breaks down — in soil or water — it doesn't leave microplastics behind. Polyester sheds microplastics every time it's washed. Lyocell does not.

Is lyocell the same as polyester?

No — they're fundamentally different materials.

• Origin: Polyester is made from petroleum. Lyocell is made from wood pulp.
• Feel: Polyester is scratchy and holds odour. Lyocell is soft and breathes well.
• Microplastics: Polyester sheds synthetic microfibres into waterways with every wash. Lyocell sheds natural fibres that break down.
• Biodegradability: Polyester persists for hundreds of years. Lyocell is biodegradable.

The confusion often comes from the fact that both can be used in activewear, and both are processed fibres — not raw natural fibres like cotton or wool. But the source material and environmental footprint are completely different. We go deeper on this in our full lyocell vs polyester comparison.

Is lyocell safe to wear?

Yes. Lyocell produced under responsible standards — particularly TENCEL™ lyocell certified by Lenzing — is tested and certified to be free of harmful substances. OEKO-TEX STANDARD 100, one of the most rigorous textile certifications, tests for over 100 harmful chemicals and is a common certification for quality lyocell.

Lyocell is also hypoallergenic and non-irritating on skin. The smooth fibre structure means it sits flat against the skin rather than scratching — important for people with sensitive skin or conditions like eczema.

There are no pesticide residues (unlike conventional cotton), no chemical finishes required to manage odour, and no PFAS treatments needed for moisture management. The fabric handles moisture naturally.

Is lyocell better than polyester for working out?

For most training contexts, yes. The key advantages:

• Odour resistance: Lyocell's smooth fibres don't trap bacteria the way polyester does. This is why polyester gym clothes develop a permanent smell that won't wash out — the bacteria is embedded in the fibre structure itself.
• Breathability: Lyocell is highly moisture-absorbent — it absorbs around 50% more moisture than cotton. Sweat is drawn into the fibre rather than sitting on top of the skin.
• Feel during exercise: Softer against skin than polyester, especially important for longer sessions or skin-contact garments.
• Environmental impact: No microplastic shedding, biodegradable at end of life.

The main trade-off is that lyocell absorbs moisture rather than wicking it to the surface to evaporate — which means it may feel slightly heavier when saturated during very intense exercise. For most training (gym sessions, padel, cycling, yoga), this is not a practical issue. For competitive endurance sport where sweat volume is extreme, a performance polyester may retain technical advantages for pure moisture management.

What about TENCEL™ lyocell specifically?

TENCEL™ is the brand name for lyocell produced by Lenzing AG, an Austrian fibre manufacturer. TENCEL™ lyocell is the same material — wood-based, biodegradable, non-plastic — but produced to Lenzing's quality controls and certified sustainable sourcing standards.

APRÍ uses TENCEL™ lyocell in all its lyocell garments. The difference between generic lyocell and TENCEL™ lyocell is similar to the difference between generic and certified pharmaceuticals — the active material is the same, but TENCEL™ comes with verified provenance and consistent quality. See our full breakdown of TENCEL vs lyocell.

The short version

Lyocell is not a plastic. It is not polyester. It is a natural, wood-derived fibre that is safe to wear, biodegradable, and genuinely better for the environment than the synthetic fabrics used in most sportswear. If you see TENCEL™ on a label, you're looking at certified lyocell from a verifiable source.

APRÍ's lyocell gym wear is made from TENCEL™ certified fibres, finished with plant-based anti-odour technology, and certified to OEKO-TEX standards. Browse the full collection.