Advertisement feature from Saint Maxime
The Saint Maxime Edit Updated this week
A sceptic reads a label
I thought “breathable” was a marketing word. Then I read my own label.
I turned my £68 “technical” leggings inside out to catch the marketing in a lie. The label read 92% polyester — and the lie, it turned out, was the one I'd been telling myself.
By the Saint Maxime editorial team 7 minute read
For everyone who rolls their eyes at swing tags
I am the person who rolls her eyes at fabric marketing. Breathable. Buttery. Cooling. Second-skin. Words invented in a meeting to move product, stitched onto a swing tag, priced at £68.
So understand the spirit in which I finally turned my most expensive “technical” leggings inside out and read the sewn-in label. Not curiosity. Spite. I was going to catch the marketing in a lie. Instead the label caught me in one I'd been telling myself for years.
It read: 92% polyester, 8% elastane. That's it. That's the whole recipe. The “breathable, sweat-wicking, cloud-soft” legging I'd worn through three years of warm offices and clammy commutes was plastic with stretch. I had been blaming my body — too warm, too sweaty, too sensitive — for the entirely predictable behaviour of a petroleum fibre.
Breathable is not a feeling. It's a measurable property of a fibre — and mine measured 0.4%.
The moment the swing tag lost the argument
What I found when I stopped scoffing
“Breathable” has an actual number, and nobody prints it on the tag
Textile science has a dry little term for how much water vapour a fibre can take into itself: moisture regain. It's measured, standardised, and published for every commercial fibre. It is, in effect, the number behind the word “breathable” — and once you know it, every legging label becomes legible.
92%
polyester in my old “breathable” pair — the label, not the adverts, tells you this
~30×
more moisture absorbed into viscose fibre than polyester (standard regain values)
2
seconds it takes to flip a waistband and read a sewn-in label in the shop
The part that actually annoyed me
The “wicking” in sports fabric is often a coating — and coatings wash off
Here's the trick hiding under half the performance-wear aisle: polyester itself repels water. To make it “moisture-wicking,” manufacturers apply a chemical finish to the surface that helps sweat spread and evaporate. It works — at first. Then it meets your washing machine.
Textile testing houses openly describe wicking finishes as durable for a number of launderings — durable, as in: it wears away, wash by wash. Which finally explained my oldest mystery: why every technical legging I've owned was brilliant for its first month and then quietly became a bin bag with a logo.
The two-flip label test I now do in every shop
- Flip one — the fibre list: a majority natural or cellulosic fibre (cotton, viscose, modal, lyocell) means the moisture behaviour is built in
- Flip two — the elastane check: 5–10% elastane is there for stretch and recovery; that's fine, it's doing a different job
- Keep: any pair where the fibre doing the touching-your-skin is one that can absorb
- Walk away: “breathable” or “wicking” on the tag of a 90%+ polyester pair — that's a finish talking, and finishes fade in the wash
Where I ended up
I went looking for a legging that passes its own label test
Which is how a professional sceptic ends up writing advertising copy — this is a Saint Maxime page, and I'd rather say so plainly than wink at you. The Bamboo Legging is the pair I'd been describing to myself before I knew it existed: viscose from bamboo and organic cotton against the skin, elastane for stretch, no polyester in the fabric. A dense 300gsm knit, so choosing natural fibre doesn't mean choosing see-through.
I've had mine four months. The behaviour hasn't washed off, because it can't.
The swing tag versus the sewn-in label
| Attribute | My old “technical” pair | Saint Maxime bamboo blend |
|---|---|---|
| The label says | 92% polyester, 8% elastane | Viscose from bamboo, organic cotton, elastane |
| “Breathable” because | A surface finish, while it lasts | The fibre itself absorbs — structural |
| Moisture regain | ~0.4% | ~11–13% |
| After 30 washes | Finish fading, clamminess returning | Same fibre, same behaviour |
| Feel against skin | Slick when dry, filmy when warm | Smooth round fibre, soft either way |
| Winter static crackle | The full firework display | Natural fibres barely generate it |
Regain values are standard commercial figures for the fibre types, not our measurements. “My old pair” describes a mainstream 92/8 polyester-elastane legging; brands vary, fibre physics doesn't.
I checked whether it was just me
The forums got there years before I did
Once converted, I did what converts do: read everything. UK forum threads with titles as blunt as “Talk to me about polyester and sweating” (a real Mumsnet thread) are full of women who ran this experiment on their own wardrobes years ago and landed on the same rule — natural fibres for anything worn close, all day. The comments below are illustrative composites of that consensus.
Three months from now
You're in a shop, any shop, and out of habit you flip a waistband inside out. Two seconds. You put it back on the rail, not offended, just informed — because the pair at home already passed. Somewhere around wash thirty, you realise the thing that always went wrong hasn't. It isn't going to. It can't.
Isn't viscose semi-synthetic? Sceptics should check that too.
Fair challenge — here's the honest version. Viscose is a regenerated cellulose fibre: it starts as plant cellulose (here, bamboo) and is processed into a spinnable fibre. The processing is industrial; the resulting fibre is chemically cellulose — the same family as cotton — which is why it absorbs moisture the way plant fibres do and polyester doesn't. We'd rather explain that than just stamp “natural” on a tag.
You mock polyester but include elastane. What's the difference?
Job description. Elastane is there for stretch and recovery — it's a small minority of the blend and it's the reason a fitted legging stays fitted. Polyester in a legging is the majority fibre, the one lying against your skin all day, doing the job the marketing calls breathing. We use a fibre that actually does that job, and elastane for the job elastane does.
Will the softness and the dry feel survive my washing machine?
Yes — that's rather the point. Absorption and smoothness are properties of the fibre, not a finish, so there's nothing to wash off. Treat them like the natural fibre they are — cool wash, dry flat, skip the hot tumble — and the pair will keep behaving like day one.
I'm still sceptical. Good. What's the exit?
Stay sceptical — just run the experiment. Wear them through your warmest, longest day. If your label test and your skin disagree with this page, send them back within 30 days for a full refund.
Don't believe this page. Read the label.
The full composition is printed on the product page — fibre by fibre, nothing hiding.
30-day returns · secure checkout
Advertisement feature from Saint Maxime. A paid editorial placement written by Saint Maxime, not an independent review — the sceptic's narrative is our copywriting, presented in first person for readability. Leggings are clothing: they do not prevent, treat or cure any medical condition, and nothing here is health advice. Moisture-regain figures (viscose ~11–13%, polyester ~0.4%, cotton ~8.5%) are standard commercial values for the fibre types under ASTM D1909; “~30×” compares those standard values. Wicking-finish durability language reflects how textile testing houses describe laundering durability generally, not a test of any named competitor. The Mumsnet thread title quoted is real and publicly viewable; forum-style comments below it are clearly-labelled illustrative composites, not verbatim quotes. Our fabric is viscose from bamboo, organic cotton and elastane; the elastane is synthetic and provides stretch.
Bamboo Leggings
$98
The consensus, in the usual words
Ruth illustrative
Smells fine out of the machine, warms up on your body and there it is again. Polyester never really washes clean.
composite of common forum sentiment
Amara illustrative
It's like wearing a shower curtain. The sweat's got nowhere to go so it just sits there with you.
composite of common forum sentiment
Linda illustrative
Since my forties I simply cannot do synthetics. Cotton, linen, viscose — suddenly I'm fine. Funny, that.
composite of common forum sentiment
Becca illustrative
Read the label is honestly the only style advice that's ever saved me money.
composite of common forum sentiment
These comments are illustrative composites of themes in public UK forum discussions about synthetic fabrics. They are not verbatim quotes, not reviews of Saint Maxime, and no one was paid to say them.