You've probably started seeing "Lyocell" or "TENCEL™" on clothing labels more often. But what actually is it — and why does it matter, especially for workout clothes?

The short answer: Lyocell is a fibre made from wood pulp using a production process so efficient it recycles 99.5% of its chemicals. It's naturally softer than polyester, more moisture-intelligent than cotton, and significantly more resistant to the bacteria that cause odour. For activewear specifically, it addresses almost everything synthetic fabrics get wrong.

Where Lyocell Comes From

Lyocell is a man-made fibre, but derived from a natural source: wood pulp from fast-growing trees — typically eucalyptus, beech, or pine — cultivated on certified sustainable plantations. The wood pulp is dissolved in a non-toxic solvent, pushed through fine spinnerets to form fibres, then solidified into the finished material.

The manufacturing process is what makes it genuinely sustainable. It operates in a closed-loop system: the solvent used to dissolve the wood pulp is captured, purified, and reused rather than being discharged into the environment. According to Lenzing AG (the company behind the leading TENCEL™ brand), up to 99.5% of the solvent is recovered and recycled in each production cycle.

Compare that to conventional cotton — which consumes enormous quantities of water and is typically grown with pesticides — or polyester, which is derived from petroleum and will never biodegrade. Lyocell's environmental profile is genuinely different, not just marketed as such.

Lyocell vs Polyester for Working Out

Polyester has dominated sportswear for decades for understandable reasons: it's cheap, durable, and excellent at moisture wicking. But it has one well-documented, difficult-to-solve problem — it holds onto odour.

Synthetic fibres like polyester are hydrophobic (they repel water). This is why they wick sweat away from the skin quickly. But it also means laundry detergent — which needs water to penetrate fabric and do its job — can't fully reach the bacteria embedded deep in synthetic fibres. Those bacteria survive the wash, and the odour returns the moment you start sweating again.

Lyocell works differently. It's hydrophilic — it absorbs moisture rather than repelling it. This sounds like a disadvantage, but in practice it means moisture is distributed more evenly across the fabric surface and evaporates more quickly, keeping you drier during activity. And because the fibre surface is naturally smooth rather than pitted, bacteria have far less surface area to colonise.

Lyocell vs Cotton for Working Out

Cotton is breathable, natural, and feels comfortable — but it absorbs moisture too well for intense exercise. During a heavy session, cotton becomes waterlogged, heavy, and takes a long time to dry. Prolonged damp fabric against skin causes discomfort and chafing, and wet fabric is an excellent environment for bacteria to thrive.

Lyocell absorbs moisture like cotton but releases it significantly faster. The result is a fabric that manages sweat intelligently: drawing it away from the skin, spreading it for faster evaporation, and drying quickly. You get the natural softness of cotton without the soaking wet feeling after 20 minutes of training.

Is Lyocell Good for Sensitive Skin?

Yes — this is one of the fabric's most consistent strengths. Lyocell fibres are naturally smooth and round, without the rough edges that can irritate skin in some synthetic fabrics. It's also hypoallergenic and doesn't promote the same bacterial growth as synthetics.

TENCEL™ Lyocell is certified to OEKO-TEX Standard 100, meaning it's been independently tested and verified to be free from harmful substances — safe for prolonged direct skin contact. For people with eczema, sensitive skin, or allergies to synthetic materials, Lyocell is frequently recommended as the better option.

Does Lyocell Last Through Training?

Durability was a concern with early-generation Lyocell — it could be prone to pilling under friction. Modern high-tenacity Lyocell (the version used in performance activewear) has substantially improved on this. With proper care — washing at 30°C, avoiding high-spin cycles — Lyocell activewear holds up well to regular training use.

There's also an indirect durability advantage: because Lyocell naturally resists odour better than synthetics, you wash it less frequently. Fewer wash cycles means less mechanical wear on the fabric, which directly extends the garment's lifespan. A shirt you wash every other use instead of after every use will last measurably longer.

Microplastics: The Issue Synthetic Brands Don't Advertise

Every time you wash synthetic activewear — polyester, nylon, elastane — it sheds microscopic plastic fibres into the water. According to research published by the French Agency for Ecological Transition (ADEME), a single wash of synthetic clothing can release hundreds of thousands of microplastic particles. These pass through wastewater treatment systems and enter rivers, oceans, and ultimately the food chain.

Lyocell sheds no microplastics. It's a natural fibre that biodegrades. If your activewear eventually reaches the end of its life and ends up in landfill, Lyocell breaks down. Polyester does not — it persists in the environment for hundreds of years.

How APRÍ Uses Lyocell

APRÍ's collection is built on TENCEL™ Lyocell as the foundation. But we took it further: all APRÍ garments are also treated with plant-based anti-odour technology — either APRÍtech™ with HeiQ Mint or APRÍshield™ with NordShield — both free from heavy metals and proven to retain 94%+ effectiveness after 20 washes.

The combination of naturally odour-resistant Lyocell fabric with plant-based anti-odour treatment creates activewear that stays genuinely fresh across multiple wears — not as a marketing claim, but in measurable, testable terms confirmed by independent testing and, more importantly, by customers who've worn the clothes through real training.

Browse the lyocell range in detail: the men's APRÍSHIELD Lyocell T-Shirt for training and everyday wear, the APRÍSHIELD Lyocell Polo for sport and casual use, and the women's Lyocell Cropped Tee — all made from certified TENCEL™ Lyocell in Portugal.

The Bottom Line

Lyocell is a better fabric for workout clothes in almost every dimension that matters to athletes and environmentally conscious consumers: softer, more breathable, naturally more resistant to odour, no microplastic shedding, and made through a production process that's genuinely more sustainable than polyester or conventional cotton.

It's not a miracle material — no fabric is. But for the specific demands of activewear, it solves the problems that synthetics have been struggling with for decades.

Explore APRÍ's Lyocell activewear collection →

Frequently Asked Questions

Is lyocell good for workout clothes?

Yes — lyocell is exceptionally well suited to activewear. Its fibres are smoother than polyester, which means bacteria have far less surface area to colonise, so garments resist odour naturally. Lyocell absorbs moisture and releases it evenly across the fabric, helping you stay drier during exercise without the waterlogged feel of cotton. It is soft against the skin, hypoallergenic, and produces no microplastic shedding. APRÍ uses TENCEL™ Lyocell as the foundation of its collection, combined with plant-based anti-odour treatment for longer freshness between washes.

How is lyocell different from polyester?

Lyocell is a natural fibre made from wood pulp in a closed-loop production process, while polyester is synthetic and made from petroleum. Polyester is hydrophobic and wicks moisture, but its pitted fibre surface traps odour-causing bacteria deep inside the fabric. Lyocell is hydrophilic, absorbing and releasing moisture evenly, and its smooth fibres naturally resist bacterial colonisation. Polyester also sheds hundreds of thousands of microplastic fibres per wash and does not biodegrade. Lyocell sheds no microplastics and breaks down naturally at end of life.

Is lyocell sustainable?

Yes — meaningfully so. Lyocell is produced from wood pulp sourced from sustainably managed plantations (typically eucalyptus, beech or pine) in a closed-loop solvent system that recovers and reuses up to 99.5% of its chemicals. It uses far less water than conventional cotton, avoids the pesticide load of non-organic cotton, and is not derived from petroleum like polyester. It is biodegradable at end of life, sheds no microplastics, and the leading brand — TENCEL™ by Lenzing — is transparent about its supply chain and certifications.

How should I wash lyocell sportswear?

Wash lyocell activewear at 30°C using a mild detergent and a gentle spin cycle. Lower temperatures protect the fibres, preserve any plant-based anti-odour treatment, and reduce energy use. Avoid high-heat tumble drying — air dry where possible. Because lyocell is naturally odour-resistant (and even more so when combined with APRÍtech™ or APRÍshield™ anti-odour treatment), you can often wear garments two to three times between washes, which further extends their lifespan and reduces environmental impact.