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  • Why better sleep starts with sustainable materials
  • Why better sleep starts with sustainable materials

    Daisy Flora


    Material & wellness · Scientific dossier

    TENCEL™ Lyocell

    Production, clinical benefits, and eco-responsibility — a synthesis of 6 reference sources

    3 French sources 3 English sources Verified data 2024–2025

    Derived from eucalyptus wood pulp and produced through a closed-loop industrial process, TENCEL™ Lyocell stands out as one of the most promising fibers in sustainable fashion — combining demonstrated dermatological performance, thermal regulation, and a reduced environmental footprint.

    99.8%
    Solvent recovery
    NMMO recovered and reused in a closed loop
    Water savings
    Less than conventional cotton per kg of fiber
    +50%
    Absorption
    More than cotton for moisture wicking
    12–16
    Weeks
    Full biodegradation in compost

    Section 01

    How is TENCEL™ produced?

    TENCEL™ is the registered trademark of Austrian company Lenzing AG. It is a natural-origin man-made fiber: it comes from plant cellulose transformed through a non-toxic chemical process. The raw material is mainly eucalyptus wood pulp, but also beech, birch, or bamboo. These trees grow without irrigation or pesticides, relying solely on rainwater, in forests certified FSC or PEFC.

    01. Cellulose extraction & dissolution

    Certified wood is turned into pulp, then dissolved in a non-toxic, recyclable solvent: NMMO (N-methylmorpholine-N-oxide). Unlike conventional viscose, which uses carbon disulfide (hazardous), NMMO is completely harmless.

    02. Fiber spinning

    The solution is extruded through spinnerets to form round, smooth fibers, which are washed and dried. It's this round cross-section that gives TENCEL™ its characteristic softness, often compared to plant-based silk.

    03. Closed loop: solvent recovery

    Over 99.8% of the NMMO solvent is recovered and reintroduced into the process. No significant chemical discharge into the environment. This is what fundamentally sets TENCEL™ apart from ordinary viscose or modal.

    Section 02

    Scientifically documented benefits

    TENCEL™'s properties stem from its unique nanofibrillar structure. Unlike cotton, whose fibers have rough surfaces, lyocell fibers are round, smooth, and naturally hydrophilic.

    A clinical study on patients with atopic dermatitis (eczema) or psoriasis showed a statistically significant improvement in SCORAD score after just 7 days of wearing TENCEL™ clothing, with no other change in treatment.

    Scientific ref.: Medical University of Innsbruck, Prof. B. Redl, 2004 · Firgo et al., 2006

    🌿
    Sensitive skin

    Round fibers with no rough edges, ideal for reactive skin, babies, and people with eczema. Validated by a randomized trial at Johns Hopkins (NCT03843437).

    💧
    Moisture management

    50 to 70% greater absorption than cotton, with rapid evacuation. Skin stays dry and cool. The nanofibrillar structure draws moisture out and transports it away from the fabric.

    🦠
    Natural antibacterial

    Up to 2,000× less bacteria than polyamide (nylon), and less than cotton or polyester. Moisture management deprives bacteria of their growth medium. Lab study, Innsbruck 2004.

    🌡️
    Active thermoregulation

    TENCEL™ is bidirectionally thermoregulating: it releases heat in warm weather and retains body warmth in cold weather — like wool, without the weight or bulk.

    Property TENCEL™ Lyocell Conventional cotton Polyester
    Moisture absorption +50–70% vs cotton Reference Low
    Sensitive skin Excellent (round fibers) Fair Possible irritation
    Antibacterial Natural (2000× nylon) Limited Promotes bacteria
    Thermoregulation Active, bidirectional Partial None
    Biodegradable Yes — 12 to 16 weeks Yes (slow) No (petrochemical)
    Water per kg of fiber < 1,000 liters > 5,000 liters Variable

    Section 03

    Eco-responsibility: verified data

    TENCEL™'s sustainability rests on three measurable pillars: sustainable forest management, the closed-loop industrial process, and the full biodegradability of the finished product.

    Environmental certifications

    EU Ecolabel FSC / PEFC USDA Biobased SBTi Net-Zero EcoVadis Platinum ISO 14040/44 LCA

    Lenzing AG carbon targets — 2024 data (SBTi-validated)

    • 42% reduction in production-site emissions by 2030
    • 25% reduction in supply-chain emissions by 2030
    • Target: net-zero carbon by 2050
    • The Thailand plant — the world's largest lyocell facility — is already carbon-neutral, biomass-powered

    TENCEL™ is 100% biodegradable and compostable — in home compost, industrial compost, freshwater, and seawater — within 12 to 16 weeks. It is one of the only high-performance fibers to offer a complete "cradle-to-cradle" lifecycle without leaving microplastics behind.

    A Life Cycle Assessment (LCA) conducted by Utrecht University (Prof. M. Patel, Li Shen) across 11 environmental factors confirms that Lenzing lyocell's footprint is significantly lower than conventional cotton across every dimension measured.

    TENCEL™ is a registered trademark of Lenzing AG

    Editorial synthesis compiled June 2026 · Sources: Lenzing AG · University of Innsbruck · University of Utrecht · Johns Hopkins · Higg MSI v3.8