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.

What Lyocell Is and Where It 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 Cotton vs Polyester: The Full Comparison

Each of the three fabrics most commonly used in t-shirts and activewear has trade-offs. Here's how lyocell measures up against cotton and polyester across the dimensions that actually matter when you're training.

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.

For a deeper side-by-side breakdown — including durability testing, microplastic data and total environmental cost — see our full Lyocell vs Polyester comparison.

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 Breathable?

Yes — lyocell is one of the more breathable fabrics used in modern activewear. Its fibre cross-section is smooth and uniformly round, which allows air to move freely through the weave. Combined with its hydrophilic properties (it actively absorbs moisture vapour and releases it into the air), this gives lyocell a thermoregulating quality: it helps keep you cooler when you're warm and feels less clammy than polyester in humid conditions.

Independent testing has shown lyocell can absorb up to 50% more moisture than cotton before feeling damp against the skin — a meaningful difference during a heavy training session. For training in heat, see our guide to the best gym clothes for hot weather.

Is Lyocell Good for Sportswear and Activewear?

Lyocell sportswear is one of the strongest fabric choices for everyday training, running, padel, yoga and gym use. The properties that make lyocell appealing in general clothing — softness, breathability, moisture management, odour resistance — are exactly the properties that matter most when you're moving and sweating.

Lyocell activewear also solves the two biggest complaints with synthetic sportswear: the smell that never fully washes out, and the microplastic shedding. For brands like APRÍ, lyocell is the foundation we build performance pieces on, then enhance with plant-based anti-odour technology rather than chemical coatings that wash away.

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.

The Certifications That Matter (And What They Actually Prove)

"Sustainable" is an easy word to use. Independently audited certifications are harder to fake. Genuine lyocell sportswear should carry one or more of the following:

• OEKO-TEX® Standard 100 — Tests the finished textile for more than 1,000 harmful substances. A guarantee that what touches your skin is free from regulated chemicals and known irritants.
• GOTS (Global Organic Textile Standard) — Covers the entire supply chain from fibre to finished garment. Includes social criteria (fair labour) alongside environmental rules.
• Bluesign® — Audits chemical inputs, water and energy use in manufacturing. The strictest certification on production-stage environmental impact.

For a deeper explanation of each, see our breakdown of OEKO-TEX, GOTS and Bluesign certifications.

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. APRÍ's plant-based anti-odour treatments are independently tested to retain 94%+ effectiveness after 20 washes, meaning a single lyocell t-shirt can replace two or three polyester ones in your training rotation. Fewer wash cycles means less mechanical wear on the fabric, which directly extends garment lifespan.

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.

Start with the pieces most people add to their rotation first: 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 APRÍSHIELD Lyocell Cropped Tee — all made from certified TENCEL™ Lyocell in GOTS-certified facilities in Portugal.

For the full picture of how lyocell performs across our range, see our complete guide to lyocell activewear.

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

What is lyocell fabric made from?

Lyocell is made from wood pulp — typically from sustainably grown eucalyptus, beech or pine trees. The pulp is dissolved in a non-toxic organic solvent, extruded into fibres and then solidified. The solvent is captured and reused in a closed-loop system that recovers up to 99.5% of the chemicals. The result is a soft, breathable, biodegradable fibre derived from a renewable source rather than petroleum.

Is lyocell the same as TENCEL™?

Effectively, yes. Lyocell is the generic name for the fibre; TENCEL™ is the trademarked brand of lyocell produced by Lenzing AG, the Austrian company that pioneered the closed-loop manufacturing process. All TENCEL™ Lyocell is lyocell, but not all lyocell is TENCEL™. APRÍ uses certified TENCEL™ Lyocell because Lenzing publishes verified sustainability data and traceability that generic lyocell often does not.

Is lyocell breathable enough for activewear?

Yes. Lyocell is more breathable than most polyesters and comparable to or better than cotton, particularly in heat. Its smooth fibre structure allows airflow through the weave, while its hydrophilic nature means it absorbs sweat vapour rather than letting it sit on the skin. Independent testing has shown lyocell can absorb up to 50% more moisture than cotton before feeling damp, which is why it's increasingly used in premium activewear and lyocell sportswear ranges.

Is lyocell better than cotton for working out?

For training, yes — lyocell handles sweat far better than cotton. Both fibres absorb moisture, but lyocell releases it much faster. Cotton becomes waterlogged and heavy during intense exercise, then takes a long time to dry. Lyocell pulls moisture from the skin, spreads it across the fabric and evaporates it quickly. The result is a drier, lighter feel during training and less chafing during long sessions.

Is lyocell good for sportswear and activewear?

Yes — lyocell activewear performs exceptionally well across most training contexts. Its smoother fibre structure resists the bacteria that cause odour, so garments stay fresher between washes. It absorbs and releases moisture evenly, helping you stay drier during exercise without the waterlogged feel of cotton. It's soft and hypoallergenic against the skin, produces no microplastic shedding, and biodegrades at end of life. APRÍ builds its entire collection on TENCEL™ Lyocell 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; 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 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 including OEKO-TEX, GOTS and Bluesign.

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, which retains 94%+ effectiveness after 20 washes), you can often wear garments two to three times between washes, which further extends their lifespan and reduces environmental impact.