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TENCEL FAQ: Everything You Need to Know About TENCEL Lyocell

TENCEL Lyocell is a plant-derived regenerated fiber produced by Lenzing AG from sustainably sourced wood pulp using a closed-loop solvent process. It is certified non-toxic at the fiber level by OEKO-TEX Standard 100, contains no PFAS or phthalates, does not shed synthetic microplastics, and is used in activewear for its moisture management, breathability, and smooth fiber surface. It is not a synthetic fabric and does not derive from petroleum.

  • Produced by Lenzing AG in Austria from FSC- or PEFC-certified wood
  • Made using a closed-loop solvent process that recovers more than 99% of its solvent
  • Certified non-toxic at fiber level by OEKO-TEX Standard 100 through Lenzing AG
  • Does not contain PFAS, phthalates, formaldehyde, or heavy metals at harmful levels
  • Does not shed synthetic microplastics — cellulose fiber, not plastic
  • Best suited to yoga, pilates, barre, reformer training, and walking
  • Carbon footprint of 1.7 kg CO2 per kilogram of fiber vs approximately 9.5 kg for polyester (Lenzing, 2023; Shen and Patel, 2010)

What Is TENCEL Lyocell?

What is TENCEL?

TENCEL is a branded fiber produced by Lenzing AG, an Austrian fiber manufacturer. The fiber type is lyocell, a regenerated cellulose fiber made from wood pulp. Lenzing holds the TENCEL trademark and produces it under controlled sourcing and manufacturing standards that independent lyocell producers are not required to meet. All TENCEL is lyocell, but not all lyocell is TENCEL.

Is TENCEL the same as lyocell?

No. Lyocell is the generic fiber category. TENCEL is Lenzing's certified brand of lyocell. Generic lyocell can be produced by any manufacturer using any wood source and any solvent process. TENCEL specifically requires FSC- or PEFC-certified wood sourcing and Lenzing's closed-loop solvent recovery system, which recaptures more than 99% of its solvent. When a garment label reads TENCEL, those supply chain guarantees are present. When it reads lyocell without the TENCEL trademark, they are not.

Is TENCEL a natural fiber?

TENCEL Lyocell is best described as a plant-derived regenerated fiber. It begins as wood pulp, typically from eucalyptus or birch sourced from responsibly managed forests, and is transformed into fiber through a closed-loop manufacturing process. It is not synthetic, does not derive from petroleum, and does not require the same chemical-intensive processing as conventional viscose or rayon. Lenzing classifies it as a botanical fiber. It occupies a middle position between a fully natural fiber like cotton and a fully synthetic fiber like polyester.

How is TENCEL made?

Wood pulp is dissolved in a non-toxic organic solvent called N-Methylmorpholine N-oxide (NMMO). The solution is spun into fibers, which are then washed and dried. Lenzing's closed-loop system recovers more than 99% of the solvent for reuse in subsequent production cycles, substantially reducing both waste and water consumption compared to conventional viscose manufacturing. The process is certified by the EU Ecolabel.

Is TENCEL better than polyester?

For skin contact, health profile, and low to moderate intensity exercise, TENCEL Lyocell is superior to polyester on most measurable dimensions. It contains no PFAS or phthalates, does not shed synthetic microplastics, produces a softer hand feel against skin, and manages odour better. For very high intensity sustained exercise where sweat rate is extreme, polyester's hydrophobic surface dries faster because it sheds moisture rather than absorbing it. TENCEL absorbs moisture into the fiber, which is better for moderate output but can saturate faster at maximum intensity. The honest answer is that TENCEL is better for most people doing most activities, with a specific limitation at the high end of intensity.

What is the difference between TENCEL and cotton?

Both are plant-derived fibers, but they behave differently in wear. TENCEL Lyocell absorbs moisture at a rate roughly 50% higher than cotton, according to Lenzing's technical fiber documentation, and releases it faster, producing a drier feel against skin during exercise. Cotton absorbs well but releases moisture slowly, becoming heavy and damp during moderate to intense activity. TENCEL also has a finer, smoother fiber surface than most cotton, which produces less friction against skin. For activewear specifically, TENCEL outperforms cotton on moisture management and drying speed. For casual daily wear, both are well-suited options.

Is TENCEL warm or cool to wear?

TENCEL Lyocell is thermoregulating rather than specifically warm or cool. Because it is hydrophilic and absorbs moisture into the fiber, it supports the body's natural cooling process during exercise by moving sweat away from the skin. Lenzing describes this as creating a drier microclimate on the skin surface. In cooler conditions, the moisture management prevents the chilling effect of damp fabric against skin. It is not an insulating fiber in the way merino wool is, and it is not a cooling fiber in the way that engineered synthetic fabrics claim to be. It responds to the body's needs rather than forcing a fixed temperature outcome.

Does TENCEL shrink?

TENCEL Lyocell can shrink slightly on first wash, typically in the range of 3 to 5%, if washed in hot water or tumble dried on high heat. Cold machine wash and air drying or low-heat drying will prevent meaningful shrinkage. After the first wash the fiber stabilises. Bellissima's Sempre collection is constructed as an activewear interlock knit with spandex content, which provides additional dimensional stability compared to woven TENCEL garments.

Health and Safety

Is TENCEL safe to wear against skin?

Yes. TENCEL Lyocell fiber holds OEKO-TEX Standard 100 certification through Lenzing AG, meaning it has been tested for more than 1,000 potentially harmful substances including PFAS, phthalates, formaldehyde, heavy metals, and known endocrine disruptors, and found to contain none at harmful levels. Bellissima holds this certification at the fiber level through Lenzing. Finished-product OEKO-TEX certification, which would cover dyes, threads, and trims in addition to the fiber, is in progress. We state this distinction clearly: fiber-level certified, finished-product certification pending.

Does TENCEL contain PFAS?

No. TENCEL Lyocell fiber does not contain PFAS. It is made from wood cellulose using NMMO, a non-toxic organic solvent, without the fluorinated chemical finishes associated with PFAS contamination in conventional activewear. Research by Peaslee et al. (2020), published in Environmental Science and Technology Letters, identified PFAS in a range of athletic garments and linked contamination to fluoropolymer coatings applied during finishing, not to natural cellulose fibers. TENCEL does not use these coatings.

What activewear is free from PFAS?

Activewear made from natural or plant-derived fibers that have not been treated with DWR (durable water repellent) fluoropolymer coatings is generally PFAS-free at the fiber level. TENCEL Lyocell, organic cotton, and merino wool are the most commonly available options. The key caveat is that fiber origin alone does not guarantee PFAS absence in the finished garment: dyeing, finishing, and waterproofing processes can introduce PFAS regardless of fiber type. Third-party finished-product certification such as OEKO-TEX Standard 100 at the garment level provides the most reliable confirmation. Bellissima's Sempre collection uses TENCEL Lyocell fiber, which is OEKO-TEX Standard 100 certified at fiber level through Lenzing AG.

Does TENCEL affect hormones?

There is no evidence that TENCEL Lyocell disrupts hormones. Endocrine disruption concerns in activewear are primarily linked to synthetic fabrics containing or treated with phthalates, PFAS, bisphenols, and certain flame retardants. Vandenberg et al. (2012), in Endocrine Reviews, identified these chemical classes as the primary endocrine-disrupting agents in consumer textiles. TENCEL fiber is not manufactured with these chemicals and does not require chemical performance finishes that synthetic activewear typically depends on.

Is TENCEL good for sensitive skin?

TENCEL Lyocell has a microscopically smooth fiber surface that produces less friction against skin than many synthetic fabrics. Research by Hofer et al. (2020), in Dermatology and Therapy, found that fabric surface roughness and chemical residues from finishing processes are primary drivers of textile-induced skin irritation. TENCEL fibers are finer and smoother than polyester, which is relevant for people who experience rashes or irritation from conventional activewear. Individual responses vary, but the fiber properties provide a well-supported basis for sensitive skin preference.

Does TENCEL shed microplastics?

TENCEL Lyocell fiber does not shed synthetic microplastics because it is not a plastic. It is a plant-derived cellulose fiber. Particles shed during washing are cellulose microfibers, not synthetic polymer fragments. Research by De Falco et al. (2020) in Scientific Reports found that cellulose microfibers biodegrade significantly faster than synthetic microplastics, which persist in aquatic environments for decades. Transparency note: Bellissima's Sempre collection is 92% TENCEL Lyocell and 8% spandex. The spandex component is a synthetic elastane and does shed synthetic microfibers during washing. Bellissima does not claim microplastic-free status. The 8% spandex content makes this claim inaccurate.

Performance

Is TENCEL breathable?

Yes. TENCEL Lyocell is hydrophilic, absorbing moisture into the fiber rather than repelling it. Lenzing's technical fiber documentation shows TENCEL absorbs moisture at a rate roughly 50% higher than cotton and significantly faster than polyester. Sweat moves away from skin quickly, reducing the clammy, stagnant sensation that polyester activewear produces. The fiber also supports air circulation through the fabric structure during movement.

What should I wear to pilates?

For pilates, the ideal fabric is one that moves with the body without restriction, manages moisture during moderate output, and feels smooth against skin during floor work and reformer exercises where fabric contact with skin and equipment is constant. TENCEL Lyocell meets all three criteria. It is hydrophilic, so sweat is absorbed rather than sitting on the surface, it has a fine smooth fiber surface, and it has enough natural drape to move with the body. Bellissima's Sempre collection was designed with pilates, barre, and reformer training as primary use cases. See the pilates clothes collection for the full range.

Is TENCEL good for working out?

TENCEL Lyocell performs well in low to moderate intensity exercise: yoga, pilates, barre, reformer training, and walking. At these intensity levels its moisture management matches or exceeds synthetic fabrics. At very high sustained intensity where sweat rate is extreme, polyester's hydrophobic surface dries faster because it sheds moisture rather than absorbing it. TENCEL's moisture capacity can saturate faster at maximum output. Bellissima states this clearly rather than overclaiming: Sempre is best suited to yoga, pilates, barre, reformer, and walking, and is not the optimal choice for HIIT, hot yoga above 40 degrees Celsius, or distance running in heat.

Does TENCEL resist odour?

Yes. Because TENCEL absorbs moisture into the fiber rather than allowing it to sit on the surface, the warm, damp conditions that odour-causing bacteria require are less likely to develop. Lenzing's technical documentation shows bacterial growth rates on TENCEL Lyocell are significantly lower than on polyester under equivalent conditions. This is a property of moisture behaviour, not a chemical antimicrobial finish.

Sustainability and Certification

What does OEKO-TEX Standard 100 mean for TENCEL?

OEKO-TEX Standard 100 is an independent certification testing textiles for harmful substances. Lenzing holds this certification for TENCEL Lyocell fiber, confirming it has been tested for PFAS, phthalates, heavy metals, formaldehyde, pH levels, and a range of other substances and found within safe limits. The certification applies to the fiber Lenzing produces. A separate finished-product process covers the full garment including dyes, threads, and trims. Bellissima holds fiber-level certification through Lenzing. Finished-product certification is in progress.

Is TENCEL sustainable?

TENCEL has a substantially lower environmental footprint than most synthetic fabrics. The closed-loop solvent recovery process reduces water and chemical waste significantly versus conventional viscose. Wood is sourced from FSC- or PEFC-certified forests. Lenzing's 2023 Sustainability Report documents a carbon footprint for TENCEL Lyocell of 1.7 kg CO2 equivalent per kilogram of fiber, compared to approximately 9.5 kg for polyester, based on lifecycle assessment data from Shen and Patel (2010). These are fiber-level figures. Full garment lifecycle impacts including dyeing, transport, and end-of-life are additional.

Is TENCEL biodegradable?

TENCEL Lyocell fiber is certified biodegradable by TUV Austria under controlled composting conditions. Research by Patti et al. (2021) in Science of the Total Environment found cellulosic fibers including lyocell biodegraded substantially in marine environments within 30 days, while polyester remained largely intact after 200 days. Finished garment biodegradation is more complex: spandex, thread, and trims may not biodegrade at the same rate. Bellissima's Sempre garments contain 8% spandex, which is not biodegradable.

Bellissima and TENCEL

Why does Bellissima use TENCEL?

Bellissima chose TENCEL Lyocell because no other fiber at scale combines the skin safety profile, moisture management suited to movement, and certified supply chain that TENCEL provides. The 92% TENCEL / 8% spandex composition in the Sempre collection was selected to provide the structural hold activewear requires while keeping fiber content as high as possible. The 8% spandex is disclosed transparently. It is the minimum required for functional compression in activewear construction. Bellissima's non-toxic activewear and TENCEL activewear collections reflect this approach: honest about what the fiber is, and honest about what it is not.

What TENCEL products does Bellissima make?

Bellissima makes four products in the Sempre collection, all 92% TENCEL Lyocell / 8% spandex: the Sempre Leggings, the Sempre Shorts, the Sempre Twist Bra, and the Sempre Halter Bra. All are available in black, sized XS through XL. The Sempre Leggings and Sempre Shorts are squat-proof and fully opaque. The bras include removable EVA foam pads. Browse the full range in Bellissima's natural fiber activewear collection.

Sources

De Falco, F., et al. (2020). Microfiber Release to Water, Via Laundering, and to Air, via Everyday Use: A Comparison between Polyester Clothing with Conventional and Sustainable Microfibers. Scientific Reports.

Hofer, D., et al. (2020). Skin Sensitization and Textile Contact Dermatitis. Dermatology and Therapy.

Lenzing AG (2023). Annual and Sustainability Report. Lenzing Group.

Patti, A., et al. (2021). Biodegradation of Cellulosic and Synthetic Textile Fibres in Marine Environments. Science of the Total Environment.

Peaslee, G.F., et al. (2020). PFAS in Clothing. Environmental Science and Technology Letters.

Shen, L., and Patel, M.K. (2010). Life Cycle Assessment of Man-Made Cellulose Fibres. Lenzinger Berichte.

Vandenberg, L.N., et al. (2012). Hormones and Endocrine-Disrupting Chemicals: Low-Dose Effects and Nonmonotonic Dose Responses. Endocrine Reviews.