How to Choose Natural Fibre Activewear Without Sacrificing Style

A few years ago, I read an article that changed the way I thought about my wardrobe forever and what I found was unsettling: the clothing industry is remarkably unregulated when it comes to the chemicals used on our skin, especially in activewear which sits so tight and close to reproductive organs. I know first hand that women  spend a lot of time in their activewear, sometimes after a workout its groceries and a coffee catch up and before you know it, you've been wearing it all day.

Here's the part most people don't realise. When you sweat, this creates a direct channel for chemicals and microplastics to be absorbed straight into the skin. The very thing marketed to make us feel fresh and dry during a workout may be doing the opposite of what "wellness" is supposed to mean.

I'm comfortable with a small amount of elastane blended into natural fibres for activewear, since you need it for stretch.  I will never buy anything labeled "sweat-wicking," because that phrase is almost always a red flag for chemical treatment.

Where Style Comes In.

Here's where I think most of the non-toxic activewear conversation goes wrong. Too many brands trying to do the right thing end up creating pieces that feel earthy, shapeless, or, frankly, a bit daggy. And I understand why that happens, but it creates a false choice: you can either protect your health or look and feel good in your workout clothes, but not both.

I don't accept that trade-off. I care about how I look just as much as anyone else. I want to walk out of Yoga and grab a coffee with friends without feeling like I'm wearing a costume for the organic lifestyle. That gap, between doing the right thing for your body and still feeling genuinely confident in it, is exactly what I set out to close with my brand, Sālli.

What Actually Goes Into Non-Toxic Activewear.

With Sālli, every piece starts with GOTS certified organic cotton as the base fibre. But rather than sourcing an existing fabric off the shelf, I design the fabric itself from scratch, custom-spun to my exact specifications: the fibre composition, the weight, the weave, all of it. It's a slower, more exacting process, but it means I can chase two things at once. Garments that are squat-proof and fully opaque when you bend or stretch, and fabric that actually feels beautiful against the skin.

To be transparent, Sālli final garments aren't independently certified, as it is expensive to get that certification and at this stage of our growth it isn't something we can't justify the expense over resleasing new products for our customers just for the badge. So, I can't put logos on my website. But the fabrics themselves come from a factory holding GOTS (Global Organic Textile Standard) and OEKO-TEX certification, with traceable batch numbers behind every roll. Testing "squat-proof" isn't a lab exercise either, it's literally trying pieces on and squatting in them, over and over, until the fabric and the cut hold up.

Busting the Biggest Myth: Sustainable is NOT Non-Toxic.

If there's one thing I want every reader to walk away understanding, it's this: sustainability and non-toxic are not the same thing, and conflating them can actually work against your health. A lot of "eco" activewear brands are simply melting down old plastic bottles and respinning them into new synthetic fabric. That might reduce landfill waste, but recycled synthetic fibres can be even more compromised than virgin synthetic ones, meaning the fabric touching your skin may be worse for you, not better.

The other myth worth retiring is "organic bamboo." It's a contradiction in terms. Bamboo the plant can be grown organically, but turning that raw bamboo into wearable fabric requires heavy chemical processing, so the resulting garment can never truly be organic, regardless of what the label claims.

How to Check a Garment Yourself.

You don't need a lab report to protect yourself, just the care label. By law, brands must disclose fabric composition, and if percentages aren't listed, the first fibre named first is often the most dominant one in the garment. Look for natural fibre activewear containing mostly organic cotton, hemp, linen, silk, cashmere, and wool.

Design Choices That Make Non-Toxic Feel Elevated.

For me, elevated style comes down to two things: fabric and cut. I lean toward black because it's sleek and never dates, and I focus my energy on how a piece actually sits and moves on the body rather than chasing trend colours. Once you make the switch away from synthetic activewear, something interesting happens.. synthetic fabric starts to feel foreign again, sticky and static against the skin, especially once you sweat in it. Your body remembers the difference.

Addressing the Price Question.

People assume non-toxic activewear always costs more, but that's not quite accurate. Some brands do charge a premium, and there's a real reason for that. Sourcing and manufacturing genuinely clean fabric is expensive. But well-made non-toxic pieces can sit in the same price bracket as premium synthetic activewear. What I've noticed instead is that some of the more affordable non-toxic options sacrifice quality, pieces that pill, stretch out of shape, or lose their structure after just a few washes. The real issue isn't toxic versus non-toxic pricing, it's quality and durability, and that's worth paying attention to regardless of which category you're shopping in.

The Mindset Shift.

More than anything, I want to challenge the idea that non-toxic activewear can't be cool. I'd love for someone to discover Sālli because they love how it looks and feels, and only afterward realise it's also better for their body rather than choosing it purely out of fear. There's a lot of marketing right now built around scaring people away from toxic fabrics, and that education matters. But I want to be the place people land once they're already convinced, offering something they genuinely want to wear. Not the best option in a disappointing category, but an aspirational style-led brand that isn't using fear as a crutch.  Instead I am laser focused on solving the problem my customer has - she just wants to look and feel cute in her activewear without having her health compromised. Anyone can make non-toxic activewear, but the real difference is in solving both problems at once. Based on what's out there in the market I feel Sālli has been the first to truly prioritise both.

Choosing non-toxic activewear shouldn't mean lowering your expectations. Yes, the feel and performance will always be different to synthetic in some ways. But you should never have to sacrifice your health to look good. With the right fabric knowledge and good taste you really can have both.