95% Australian superfine merino
Soft, breathable, premium natural fibre.
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
Mays (170cm) wears size 12
Emily (167cm) wears size 8
| 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 39 reviews.
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"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."
"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"
"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!"
"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!"
"Seriously, no notes. I'm obsessed with the fit; perfect for low impact sports and walking/every day, I have the matching shorts and I constantly get complimented whenever I wear the set. I’ve been wanting to move away from polyester activewear for ages but didn’t really know where to start, and now Estroni is my new go-to! Obsessed."
"Love the soft feel of this bra, it’s not itchy and it fits perfect with good coverage !"
"These are snug and comfortable, really supportive for a thin strap bra. I haven’t done anything high impact but for walking and Pilates it’s been perfect"
"Love the quality and was able to use it in my heated workout class! So good to not sweat in plastic and it dry so quickly! I should had sized up because it’s a little tight but still feel comfortable. I’ll order more but in size 6:"
"The fabric is very soft and durable, padding is comfortable and it is true to size. Will definitely buy more!"
