Jan 2, 2026Natural Living

Non-toxic Fabric Guide

Last updated: 08.12.26

Non-toxic fashion means clothing made from natural fibers, without hidden chemicals. It looks good on you now, and it won't cause problems later, for your skin or your health.

Knowing what's actually in your closet helps you shop smarter. Use this guide as your cheat sheet: our curated list of Isla & Saige-approved fabrics, chosen for performance, longevity, and low toxicity.

Protein Fibers (Animal Fabrics)

Animal fibers get a bad rap because of unethical sourcing in parts of the fashion industry. But when animals are raised and sheared responsibly, shearing actually helps them: sheep and goats can overheat or get hurt if they're not sheared. Done right, this process gives us fibers that are naturally biodegradable, breathable, and temperature-regulating.

Quick fact: "Wool" is a blanket term for animal hair fibers. Sheep's wool is the only one allowed to be labeled simply "wool" by law. Cashmere, alpaca, and mohair are technically wool too, they just go by their own names.

Merino Wool

The soft, luxurious wool most people picture. Great for base layers, sweaters, and jackets.

Breathable and moisture-absorbing: reacts to your body temperature, keeping you cool when it's hot and warm when it's not
Naturally odor-resistant: traps odor-causing bacteria until you wash it out
Naturally water-resistant: a natural wax coating repels moisture on the surface instead of soaking it in

Cheap wool is where the "itchy and high-maintenance" reputation comes from. Quality wool doesn't have that problem. Look for certified wool, like NATIVA, Woolmark, Shaniko Wool, ZQ Wool, or Wooltrace, as a sign of quality and ethical sourcing. A wool-silk blend is a great sign of quality; a wool-poly blend usually means cheap, short-lived, and full of plastic.

If a brand isn't transparent about where their wool comes from, that's worth digging into.

Alpaca

Incredibly fine and silky, alpaca traps heat more efficiently than Merino, so it's warmer without being bulky. It's also:

Fully biodegradable: no microplastics left behind
Hypoallergenic: unlike Merino, it has no lanolin, so it's a better option for sensitive skin
Long-lasting: doesn't need frequent washing

If wool has ever made you itch, alpaca is worth trying.

Cashmere

Ultra-lightweight but still seriously warm, thanks to its fine fibers. Like alpaca, it's naturally hypoallergenic and lanolin-free. Well-made cashmere is more durable than its "delicate" reputation suggests, and it's naturally odor-resistant, too.

Mohair

One of the oldest textile fibers around, prized for its sheen, durability, and silky feel. It's wrinkle-resistant, water-repellent (similar to Merino), and takes dye so easily it skips the harsh chemical dyeing process used on synthetics like acrylic.

As with all animal fibers, sourcing matters. Look into a brand's shearing practices before you buy.

Silk

Nothing quite matches silk's drape; synthetic satin doesn't come close. It's naturally hypoallergenic, antibacterial, and breathable. Look for OEKO-TEX or GOTS certification to confirm it was dyed responsibly.

Plant Fibers

Clean, breathable, and already woven into most of our wardrobes, with a few details worth knowing before you buy.

Linen

One of the cleanest fibers from farm to finish. It needs very little water, fertilizer, or pesticides to grow, thanks to its natural pest resistance. It's naturally antibacterial and hypoallergenic, and it only gets better with age.

The catch: linen wrinkles, a lot. That's part of its charm. But if a brand claims their linen is "wrinkle-free," it's likely blended with plastic or treated with chemical finishes, best to skip those.

Cotton

The most common fabric in your closet, and for good reason: breathable, strong, and endlessly versatile. Cared for properly, it lasts for years.

The catch: conventional cotton is often grown with pesticides. Look for organic cotton or OEKO-TEX certification to avoid that. These standards ensure no synthetic chemicals were used in growing it.

A note from us: as a small brand, sourcing fully organic cotton that fits our designs is a challenge, larger brands often have access to custom fabrics we don't. We're working toward fully organic cotton by 2027. In the meantime, our non-organic cotton is still a cleaner choice than any synthetic.

Hemp

An underrated fiber that shares many of linen's best qualities, sometimes it's even blended in as a substitute for flax. It grows with minimal resources and no pesticides, and it's durable, versatile, and hypoallergenic.

The catch: hemp can be harder to find and pricier, thanks to its complicated regulatory history. Worth the investment.

Regenerated Cellulose Fibers

Fabrics like bamboo and viscose are made from wood pulp, but don't let "natural" fool you. Turning wood pulp into fabric requires an extensive chemical process, so these are actually semi-synthetic.

TENCEL™ (Lyocell)

TENCEL™ is also wood pulp-based, but it's a clean upgrade over standard bamboo or viscose. The difference is its closed-loop production: the chemical solvents used are captured and reused, never released into the environment.

TENCEL™ is OEKO-TEX® certified and produces fabrics like Lyocell and Modal. Look specifically for the TENCEL™ brand name; that's what guarantees the clean, closed-loop process.

Natural fibers are always our first choice. But for performance needs, like activewear, TENCEL™ is the cleanest option available.

Labels & Certifications to Know

A quick cheat sheet for what to look for on a tag:

Certification	What it means
OEKO-TEX Standard 100	Tests for 1,000+ harmful substances, confirming the fabric is safe for skin
GOTS (Global Organic Textile Standard)	Covers organic farming through dye safety and ethical production, mainly for cotton and natural fibers
Fair Trade Certified	Confirms fair treatment of workers and ethical supply chains — a hard-to-earn certification with extensive audits

Fabrics We Avoid

What we don't use matters as much as what we do. Here's why these are off the list:

Polyester: A petroleum-based fiber treated with toxic chemicals (PFAs, antimony trioxide) to make it water-, stain-, and flame-resistant. PFAs are "forever chemicals" linked to endocrine disruption; antimony trioxide has been linked to liver, heart, and kidney damage. It also sheds microplastics and traps heat.

Nylon: Fully synthetic and petroleum-based, made using PFAs and heavy metals in production and dyeing.

Acrylic: Often masquerades as wool, but it's petroleum-based, pills quickly, and sheds microplastics. Its production involves acrylonitrile, a probable carcinogen, and it's commonly linked to skin irritation, allergic reactions, and respiratory issues.

Viscose / Rayon (conventional): Made with toxic solvents like carbon disulfide that can pollute waterways and harm workers, without the closed-loop protections TENCEL™ uses.

How to Shop Non-Toxic: Quick Checklist

Save this for your next shopping trip.

Start with natural fibers — wool, linen, cotton, silk, hemp
Check the labels — look for GOTS, OEKO-TEX®, and NATIVA™
Skip synthetic blends — polyester and poly-blends shed microplastics and rely on harsh chemicals
Choose transparency — support brands that share where and how their materials are made
Ask questions — Where did this fiber come from? Who made it? What dyes were used?

We know this is a lot to take in. But the upside goes beyond your health: choosing natural fibers means investing in pieces that last—ones that feel intentional and live beautifully in your wardrobe for years.

At Isla & Saige, we design with care for the woman who wears our pieces and the life she lives. Save this guide, and explore our collections to find pieces that align with your values: fewer, better, cleaner, and made to last.

Start Building Your Clean Closet