You're shopping Estroni's US store — prices in USD, shipping to the United States.
This site has limited support for your browser. We recommend switching to Edge, Chrome, Safari, or Firefox.

Free shipping to the US on orders over US$250

OEKO TEX Standard 100 certified

Merino Sports Bra - Racerback

$89.00
ColourVanilla
Size Find your size Need help? 12
  • 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.



Free shipping to the US on orders over US$250, or a flat US$21.95 under that.
US import duty is added at checkout. Nothing more to pay on delivery.

The Merino Sports Bra (Racerback) 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.

Made from 95% fine merino wool with a touch of stretch, it offers a supportive, streamlined fit that moves with you. The racerback design allows full freedom of movement, while removable padding lets you adjust coverage for training or everyday wear.

Why you’ll love it

  • 95% merino wool, 5% elastane – natural performance without plastic-heavy fabrics

  • Racerback design – full range of movement

  • Removable padding – adjustable coverage and support

  • Breathable & odour-resistant – wear more, wash less

  • Soft, supportive stretch – no dig-in, no cling

  • Lightweight & shape-holding – keeps its fit through movement

  • Designed in Australia using premium ultra-fine merino fibres

Why women choose this over polyester

  • No plastic feel when sweating

  • Gentle on sensitive or hormonal skin

  • Comfortable enough to wear beyond workouts

Model & sizing

Mays (170cm) wears size 12
Emily (167cm) wears size 8

Ask Us Anything

Overall rating: 4.6 out of 5 from 19 customer reviews, 18 of them from verified buyers.

Rating breakdown: 5 star: 14, 4 star: 3, 3 star: 2.

Reviews

Mostly good. . .

"The material feels high quality and soft which I did expect, but still so nice to touch and feels like nothing to wear. The only thing I would say is where the material joins at the shoulder there is quite a lump at the join and it is not the cleanest (one side is marginally larger than the other). This part of the design could be improved in the future to have a flatter join. This is just and aesthetic thing and doesn't seem to take away from the comfort. It does include removable pads which I didn't realise (definitely don't need them though). Would probably go up a size next time as six is on the snug side (still comfy though)."

Charlotte H. (4/5, verified buyer, 26 August 2026)

Size Up

"The elastabe portion feels slightly uncomfortable and the shoulder portion is a bit tight. But if I were to size up, the cup size would be way too big."

Fusi T. (3/5, verified buyer, 25 June 2026)

Love the material and size

"Love the material and size 6 was perfect as I want it to be tight on the chest and the bra was stretchy enough to wear on that time of the month!"

Joanna T. (5/5, verified buyer, 8 June 2026)

lOVE THE MATERIAL!

"Love the feel of this bra, and it’s not itchy at all! I think I may have needed to size down for a bit more support, as I noticed it felt slightly loose during an intense workout. Still great quality though!"

Jocelyn L. (5/5, verified buyer, 7 May 2026)

Absolutely love!

"These sports bras are so soft and yet supportive! I absolutely love them!"

Jessica G. (5/5, verified buyer, 29 April 2026)

5 Stars!

"Great fit and the feel is amazing :)"

Jordi T. (5/5, verified buyer, 25 April 2026)

Soft & supportive

"I received mine yesterday and it is by far the softest sports bar I’ve worn. It’s super supportive (already tested a workout in it) and will definitely be ordering more."

Natalie (5/5, 20 April 2026)

New favourite bra

"Great quality, great shape plus the material feels nice and is non toxic"

mikayla (5/5, verified buyer, 18 April 2026)

Great material

"Love love love the black race back. The white is lovely material but it’s see through and the cups are so noticeable. Such a shame about the white, because I loved it so much I got it in white after owning black."

Belinda M. (4/5, verified buyer, 30 March 2026)

Merino crop

"I love the feel of the crop, however it seems that although the cup size is correct, the band is too loose! I think I need a middle size?"

paul s. (5/5, verified buyer, 9 March 2026)

Favourite racerback crop

"Love the fabric and fit of this racerback. I’m a size 8 w D boobs and the fit is firm and supportive. This particular style works well for exercise class as it’s slightly higher than the cross straps one available so my boobs feel secured. Cross back still works but my boobs are out a bit more and depending on what exercise I’m doing, it’s not always suitable. Looking forward to receiving my shorts in the mail as pre-ordered them once I felt how comfy the crops were!"

Lauren M. (5/5, verified buyer, 9 March 2026)

Love a wool garment!

"I wear a US 32C and got the size 8. It fits perfectly everywhere except the straps—these are a bit too snug. I will likely size up for the next order. Washes well. No itching."

Amy Z. (5/5, verified buyer, 9 March 2026)

My first foray into merino activewear

"It's comfortable and soft, the size is good (I wear a 10E/F bra), though it's not super supportive. I've been wearing it for weight lifting sessions in the gym and I've worn it three times in a row without washing and it doesn't smell bad. The tiniest bit itchy sometimes. Would definitely buy another one."

Wendy L. (4/5, verified buyer, 9 March 2026)

So Comfy

"Love the material, so soft and comfortable. However, hate the removable padding. It had to be readjusted all the time."

April L. (3/5, verified buyer, 22 February 2026)

So cute & comfy!

"Probably one of my new favorite sports bras! So soft and feels really supportive. Feels like a nice hug and the straps don’t dig at all. I sized down bc I’m in between sizes and it fits great! (Usually AU8 5’6 125lb b/c cup). I also got the white tank to layer with it and they layer so well together! I thought the wool might feel thick but it’s actually perfectly thin and stretchy while still feeling substantial enough to hold everything in. Love!"

Brittany J. (5/5, verified buyer, 17 February 2026)

Super comfy

"I love this bra for ny intense cardio sessions!! Looking forward to purchasing more 😁"

Kimi O. (5/5, verified buyer, 28 January 2026)

Ok… This Is My New Favourite Sports Bra

"I love this sports bra!! I purchased the Estroni merino wool sports bra racer back in caviar and it is comfy as! Light to touch and feels soft as. It’s perfect in hot, humid Darwin weather. I’m impressed! My new go too for activewear :hands_heart_medium_skin_tone: the attention to detail is impressive right down to the packaging! Thankyou!!!"

Alison S. (5/5, verified buyer, 7 January 2026)

Amazing quality!

"Seriously love this piece - it is so soft and comfortable and high quality. I also really loved the entire experience of opening up this package - it’s so thoughtfully presented. It actually makes a perfect gift!"

Ellie W. (5/5, verified buyer, 26 December 2025)

Supportive and soft

"This feels amazing on and also more supportive than expected. The narrow back is a flattering shape!"

Sophia (5/5, verified buyer, 17 December 2025)

Sign up to mailing list for 10% off your first order!

Cart

No more products available for purchase