Vegan
How we decideModal is vegan. Lenzing spins it from beechwood pulp (Fagus sylvatica) that regenerates in Central European forests without irrigation or replanting, using a modified viscose process with partial chemical recovery.
- Origin
- Plant-derived but chemically processed — produced from cellulose extracted from beechwood (Fagus sylvatica), primarily from Austrian and Central European forests. Uses a modified viscose process.
- Common Uses
- Underwear, nightwear, T-shirts, sportswear, towels. Often blended with cotton or TENCEL.
- Durability
- Very good. Softer than cotton, retains shape better than standard viscose, and remains soft after repeated washing.
Environmental Impact
Medium Environmental ImpactBeechwood grows naturally in Central European forests without irrigation or replanting — considered a sustainable raw material. Lenzing (the dominant producer) sources from FSC-certified forests. The chemical processing stage (similar to viscose) uses caustic soda and carbon disulphide, though Lenzing uses a partially closed-loop system recovering some chemicals.
Editorial Notes
Modal is marketed as a premium viscose-type fiber. Lenzing's Modal is probably the most recognized brand. It is considerably softer and more durable than standard viscose/rayon. The primary concern is the chemical-intensive viscose production route, not animal welfare — Modal is fully vegan.
In depth
How Modal Is Made
Modal is a semi-synthetic cellulosic fiber. The raw material is plant cellulose, but the fiber itself is formed through industrial chemical processing. Production starts with beechwood, which is chipped and pulped to extract cellulose. The pulp is treated with caustic soda and carbon disulfide to create a viscous spinning solution. Spinnerets extrude that solution into an acid bath, where it solidifies into continuous filaments.
The process is a modified version of standard viscose manufacturing. Different chemical concentrations, spinning conditions, and stretching of the fiber produce what the industry calls a high wet modulus (HWM) rayon. In practical terms, Modal keeps its strength when wet, and it survives machine washing far better than ordinary viscose.
The Austrian company Lenzing AG is the best-known producer and treats Modal as a branded fiber. Lenzing sources beechwood from Central European forests. The company recovers a portion of the process chemicals in a partially closed-loop system. No animal-derived inputs are involved at any stage of standard Modal production.
How to Spot It on Labels
Modal is a recognized generic fiber name in both the EU and the US. Garment labels carry it under its own name. In the EU, textile labeling regulation lists "modal" as a distinct fiber category separate from viscose. In the US, the Federal Trade Commission treats modal as a type of rayon, so labels may read "modal," "rayon (modal)," or simply "rayon."
Branded versions add trade names. "Lenzing Modal," "TENCEL Modal," and "MicroModal" all refer to Lenzing's fibers. MicroModal is a finer variant used in premium underwear.
The fiber content line matters more than the marketing name. Modal is very frequently blended. The Modal component is always vegan. The rest of the blend deserves attention, since some knitwear combines modal with wool, cashmere, or silk. Typical labels read "50% cotton, 50% modal" or "92% modal, 8% elastane."
Modal Compared with Other Fibers
Within the cellulosic family, Modal sits between standard viscose and lyocell. The fiber is softer and more durable than ordinary viscose, particularly when wet. But it is made with the same core chemistry, including carbon disulfide, a chemical with well-documented occupational health concerns when not properly contained. Lyocell (TENCEL) uses a different, cleaner solvent process with a nearly closed loop, and is generally considered the more environmentally responsible choice of the two.
Against animal fibers, Modal is a common functional substitute for silk in underwear, nightwear, and draped tops. The fiber has a smooth hand, natural sheen, and good breathability. Blended with synthetics or cotton, it also replaces fine merino wool in lightweight base layers. It does not match wool's insulation when wet.
Compared with cotton, Modal is softer, more absorbent, and less prone to shrinking. Modal is also more delicate at high washing temperatures and usually more expensive. For vegans, all of these plant and synthetic options are acceptable, so the choice comes down to performance, price, and environmental priorities.
Where You Will Encounter It
Underwear and loungewear are where modal concentrates. Premium underwear brands rely heavily on modal and MicroModal because the fiber stays soft against skin after repeated washing. Nightwear, T-shirts, camisoles, and lightweight jersey dresses use it just as often.
Beyond clothing, modal appears in bed linens, towels, and bathrobes, often blended with cotton to add softness and absorbency. Sportswear brands use modal blends in casual and yoga lines. High-performance athletic wear usually favors polyester or nylon for moisture management.
From a vegan standpoint, the fiber itself never poses a problem. The practical points to check sit elsewhere in the finished product. Knitwear labeled "modal blend" occasionally contains a percentage of wool or cashmere. Garment trims can also be non-vegan: leather patches on waistbands, mother-of-pearl buttons, or silk linings. The complete fiber content label and trim details determine whether the finished garment is vegan.
Frequently asked questions
Is modal fabric vegan?
Yes, modal is vegan. The fiber is made entirely from beechwood cellulose processed with industrial chemicals, and no animal-derived substances are used in standard production. Modal is often blended with other fibers. Check the full fiber content label for wool, silk, or cashmere in the mix.
Is modal the same as viscose or rayon?
Modal is a type of rayon, but it is not identical to standard viscose. A modified viscose process yields a stronger fiber, classified as high wet modulus (HWM) rayon. It holds up much better to washing. In the EU, modal is labeled as its own fiber category. In the US, it may appear as either "modal" or simply "rayon."
Is modal a natural or synthetic fabric?
Modal is semi-synthetic. The raw material is natural plant cellulose from beechwood, but the fiber is created through chemical processing, so it is neither fully natural like cotton nor fully synthetic like polyester. The industry term for this category is regenerated cellulosic fiber.
Is modal environmentally friendly?
Modal is moderately environmentally friendly, with clear trade-offs. Beechwood is a low-input raw material that grows without irrigation. The main producer, Lenzing, sources from certified forests and recovers part of its process chemicals. The viscose-type process still uses carbon disulfide and caustic soda, so modal is generally rated worse than lyocell (TENCEL) but better than conventional viscose.
What is the difference between modal and TENCEL?
They use different manufacturing processes. TENCEL is a Lenzing brand name primarily associated with lyocell, which is produced in a nearly closed-loop system using a less hazardous solvent. Modal is made by a modified viscose process with harsher chemistry. Both are regenerated cellulosic fibers. Lenzing produces both. The company also markets "TENCEL Modal," its modal fiber sold under the TENCEL brand umbrella. Both fibers are vegan.
Is modal a good vegan alternative to silk?
Yes, modal is one of the most common plant-based substitutes for silk. Underwear, nightwear, and drapey tops use it most. It offers a smooth surface, soft drape, and slight natural sheen at a lower price than silk. It also machine-washes better. It does not perfectly replicate silk's luster or insulating properties, but for everyday garments it is a close functional match.