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: 5.0 / 5 from 44 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"
"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."
"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!"
"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!"
"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"
"Such amazing fabric and a beautiful supportive crop!! Wore this in a heated room Pilates class and was so happy with how it worked with sweat - the top stayed so dry compared to other fabrics !!"
"I love being able to wear natural fabric. I have been searching for a long time! I love the sport bra because I also use it as an everyday bra in this heat!"
"I wear it running, strength training and doing Pilates and it can be worn multiple times no worries. I’m in love."
"The fit and support is great even if they’re only thin straps at the back. It’s not buttery soft, but it’s soft enough as the majority of the material is made out of merino wool. Good purchase! More colors hopefully!"
"Super supportive and love the cross back. The design is flawless and comfortable to wear all day. Highly recommend all of Estronis pieces as they never miss!! Love what they are doing and shipping is always so so fast."
