Modal vs TENCEL vs Lyocell — What's the Difference?

You've seen them on care labels, in brand copy, in sustainable fashion conversations. Modal, TENCEL, and Lyocell — three names that appear almost interchangeably in natural fiber clothing, yet carry meaningfully different implications. If you've ever wondered whether they're the same thing, here's the clearest breakdown we can give you.

The short answer: they're related but not identical. All three are made from wood pulp and processed into a soft, breathable fiber. But they differ in the specific wood source used, the manufacturing process, how closed-loop that process is, and ultimately, their environmental footprint. The distinction matters if you care about what you're actually putting on your skin — and the planet.

What Are These Fabrics, Exactly?

All three fall into a category called semi-synthetic fibers or regenerated cellulosic fibers. The term sounds technical but the concept is simple: take a natural cellulose source (wood, bamboo, or other plant matter), dissolve it into a liquid solution, and push that solution through small holes to create fibers that can be spun into yarn.

The result is a fiber that shares properties with natural fibers — breathability, softness, moisture management — while being manufactured rather than grown and harvested directly. This is different from fully synthetic fibers like polyester, which start from petroleum products and share almost nothing with natural materials.

Where modal, TENCEL, and lyocell diverge is in the specifics: what wood is used, what chemical process dissolves it, how much of that chemical is recovered and reused, and who makes it under what standards.

The Three Fibers Side by Side

Modal: The Softness Benchmark

Modal is made primarily from beechwood pulp using a modified viscose process. It's been around since the 1950s and is best known for producing an exceptionally soft, smooth fiber — often described as feeling like a second skin. If you've ever worn a pair of underwear or a t-shirt that felt noticeably silkier than cotton without being actual silk, it was likely modal.

The limitation of modal is its manufacturing process. The modified viscose process uses a significant amount of chemical solvents, and while it's generally considered cleaner than standard viscose (rayon), chemical recovery is only partial. Some solvents are lost during processing and must be disposed of. It's better than fully synthetic manufacturing, but it's not as clean as the closed-loop alternatives.

That said, modal is still a wood-derived fiber, it's biodegradable, and it's far preferable to polyester. For softness-first applications like loungewear and base layers, it's hard to beat.

TENCEL™: The Gold Standard

TENCEL is a brand name owned by Lenzing AG, an Austrian company, and it refers to their lyocell fiber made under their specific closed-loop manufacturing process. When you see TENCEL on a care label, you know exactly who made it and under what standards — which is actually unusual in the textile industry.

The TENCEL process dissolves wood pulp in a non-toxic solvent called NMMO (N-Methylmorpholine N-oxide). What makes it genuinely different from modal is the closed-loop system: Lenzing recovers and reuses more than 99% of that solvent in subsequent production cycles. The water used in processing is also recycled. The result is a fiber with a significantly lower chemical and water footprint than modal or standard viscose.

TENCEL fibers are also produced from certified sustainably managed forests. Lenzing publishes detailed environmental impact data and holds multiple third-party certifications including EU Ecolabel and OEKO-TEX. For consumers who want verifiable claims rather than marketing copy, TENCEL offers more transparency than most alternatives.

The fiber itself feels smooth, drapes beautifully, is highly breathable, and manages moisture extremely well — outperforming cotton in most tests. It's the material we use for our Modal Lounge Set at Princess Strawberry, and the reason we specifically specify TENCEL rather than generic modal or lyocell.

Lyocell: The Process, Not a Brand

Lyocell is a fiber type, not a brand. It describes any fiber made using the closed-loop solvent spinning process — which means TENCEL is a type of lyocell, but not all lyocell is TENCEL.

Other manufacturers produce lyocell fibers, and the quality and environmental standards vary significantly between producers. Some use sustainably certified wood; others don't. Some maintain rigorous solvent recovery rates; others achieve less. When a garment label says "lyocell" without specifying the source, you're left with less certainty about the actual production standards than if it says TENCEL.

This doesn't mean generic lyocell is bad — the closed-loop process is genuinely cleaner than modal or standard viscose regardless of manufacturer. But without third-party certification, the environmental claims are harder to verify.

What About Rayon and Viscose?

Rayon (also sold as viscose) is the older relative of all three fibers. Like modal and lyocell, it's made from wood pulp — but the standard viscose process uses carbon disulfide, a toxic solvent that is difficult to recover and creates environmental issues during disposal. While viscose is technically a plant-derived fiber, its manufacturing footprint is substantially worse than modal or lyocell.

If you see rayon or viscose on a label without any certification, it's worth approaching with caution. It's not as bad as polyester, but it's not as clean as TENCEL or good-quality modal either. We don't use rayon in any Princess Strawberry pieces for this reason.

Quick Comparison Summary

Which Should You Choose?

If you want the most verifiable, environmentally considered option, TENCEL is the clear answer. The closed-loop process, certified wood sourcing, and third-party certifications make it the most transparent choice in the semi-synthetic category.

If TENCEL isn't available in the specific garment you want, a certified lyocell from a reputable manufacturer is a good second choice. Modal is a reasonable option for softness-priority pieces, with the caveat that its manufacturing process is less clean than the lyocell alternatives.

All three are significantly better than polyester, rayon, or standard viscose. If you're building a wardrobe around natural and low-impact fibers, any of the three belongs in it. Just know what you're choosing and why.

The same principle applies to caring for these fibers. Unlike washing silk, modal and lyocell are generally machine washable on a gentle cycle with cool water — one of their practical advantages over more delicate natural fibers.