95% Australian superfine merino
Finer than hair, so no itch.
Naturally odour-resistant
Stay fresh longer between washes.
Temperature regulating
Comfort across warm + cool days.
OEKO-TEX® certified
Made with care for sensitive skin.
The Merino Sports Bra (Crossback) is women's natural fibre activewear — a merino wool sports bra made from 95% merino wool, with no polyester. A non toxic alternative to synthetic sports bras, designed in Australia for sensitive skin.
Soft, breathable comfort - even when you sweat.
This merino wool sports bra feels comfortable on the skin without the slick, synthetic feel of polyester.
The slim 1cm crossback straps and curved V-front neckline create a clean, flattering fit, while removable padding allows you to adjust coverage for training or everyday wear.
95% merino wool, 5% elastane – natural performance without plastic-heavy fabrics
Breathable & odour-resistant – wear more, wash less
Soft, supportive stretch – no dig-in, no cling
Slim crossback straps – minimal feel with full freedom of movement
Flattering V-front neckline – clean, feminine shape
Removable padding – adjustable coverage
Lightweight & shape-holding – keeps its fit over time
Designed in Australia using premium ultra-fine merino fibres
No plastic feel when sweating
Gentle on sensitive or hormonal skin
Comfortable enough to wear beyond workouts
| Estroni merino | Polyester activewear | Cotton | |
|---|---|---|---|
| Stays fresh between wears (odour-resistant) | ✓ | ✕ | ✕ |
| Regulates temperature — cool in heat, warm in cool | ✓ | ✕ | ✕ |
| Wicks sweat without the clammy, plastic feel | ✓ | partly | ✕ |
| No polyester or nylon | ✓ | ✕ | ✓ |
| Lets skin breathe | ✓ | ✕ | partly |
| Soft and non-itchy on skin | ✓ | ✓ | ✓ |
Overall rating: 4.92 / 5 from 50 reviews.
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"I absolutely adore this top. I’m usually a size 6 and the size 6 for this cross back fits me perfectly! The indigo colour is stunning and versatile to wear with other bottoms I own. No digging into the skin, I could wear it all day. Great for movement and lounging. Soft material and supportive. Beautiful piece! I’d buy them in every colour"
"Absolutely been loving this sports bra. The top is so flattering and love the thin straps and cross back. It’s such good quality, comfortable to wear all day and holds up well during my workouts. Definitely going to be adding more colours to my collection"
"This is so supportive and comfortable. I love the fit and style!! I’m a 32B (US) and the size 6 is perfect"
"I’m an Alo girl through and through…I searched far and wide for a polyester free substitute. Watched all the TikTok reviews, scoured the internet for the "best" alternatives. I settled on Estroni, and thank god I did. Fits so superbly, and looks amazing. Well worth the ££. Haven’t yet worked out in it, or worn it frequently, so might pop back here in a few months. If you’re on the fence, I would totally get off the fence and buy it."
"I loveee the cocoa merino sports bra! The fit is spot on, I'm normally and 8 and the 8 fit. Good support, flattering fit and love the colour. Can't wait to get more!"
"This sports bra is so nice. The scarlet red colour is stunning. It is super comfortable and doesn’t dig in anywhere. It provides good support and I’ve found the fabric is really breathable and also very soft!"
"Hi! I wear sports bras all day/every day, as breastfeeding for a long time made the girls a bit deflated and hard to make look nice in bras and tops with little support or coverage. I’m also very active and have lately been on a mission to find non-toxic plastic-free active wear, especially tops, to make sure I protect my body from micro plastics. I was SO excited to find merino tops and immediately purchased the cross back to wear all day ~ I got a size M (I’m a size 10/12/28” waist, if this helps) and it is very comfortable, sits very nicely on ~ no bounce ;) The fabric is soft and firm, and there are no annoying tags or seams. The tops can be worn all day, and gives the girls a good shape without being too heavily padded (the padding is actually perfect! Not rec gen thin and flimsy and not lorna jane thick (for those who like vivid descriptions!)) Safe to say, I found my go to, and will now change out all my active wear from overpriced polyester and nylon, to skin friendly and supportive, natural, breathing, self cleaning (yes! Merino is magic!), safe and low-tox active wear ✨ Thank you so much for creating this brand!! And if in doubt, I say, try it! Your body is worth it! All the best, Kari"
"Estroni's peices are some of the best natural fibre activewear I have tried. I am so impressed with the fabric quality, it feels tight fitting yet soft to touch, it is thick yet breathable. The styles of the crop is also extemely flattering. I really really love this piece!"
"Love the simple cross back design! Comfortable enough to wear all day but supportive for exercising too."
"I have been looking at this bra for ages and finally when I looked it was in stock in the sizes I wanted, so I did it. I love it, it’s so soft and doesn’t itch at all! I got a size 8 and found the size good, I was worried how it would sit as I’m a 10DD but it fits well! Will be buying more styles as I love that this is nearly all merino wool. Thank you"
