Why We Like The icebreaker Siren Bra
From cragging to lounging, the icebreaker Siren Bra gives us the soft, breathable coverage of merino wool, the durability of nylon, and the support of spandex, ensuring lasting comfort no matter what the day holds.
Details
- Smooth, light bra for adventures on mountain and in town
- Merino blend thermoregulates, manages moisture, and resists odors
- Touch of stretch and flatlock seams for low-friction movement
- Adjustable shoulder straps offer a customized fit
- Item #ICEZ6P7
- Material
- Merino Corespun (83% merino wool, 12% nylon, 5% spandex)
- Support
- low-impact
- Anti-Odor
- natural attribute of merino wool
- Manufacturer Warranty
- 1 year
- Activity
- casual, hiking, climbing, training
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 117 ratings
Review Summary
Fits Slightly Small
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.Customer Images
Here's what customers have to say
The product is generally well-received, with customers praising its comfort, breathability, and moisture-wicking properties. Many describe it as comfortable and suitable for various activities. While the fit may not be perfect for everyone, with some finding the cups too small or the straps digging in, the majority of reviews suggest it is a versatile and high-quality option.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageSeptember 20, 2025
My new everyday bra
[This review was collected as part of a promotion.] I love this bra! So comfy. Note that it runs small. I normally wear a M but ended up needing a L. My bra size is 34C but I'd rather it be a tiny bit large than too tight (I tried both sizes).
Originally reviewed on icebreaker.com
September 13, 2025
Comfy but runs small
[This review was collected as part of a promotion.] Bought 3. I have eczema so during flare ups they can be a bit itchy, otherwise I find them soft and comfy. Would recommend sizing up if you're on the fence.
Originally reviewed on icebreaker.com
September 13, 2025
Everyday use
[This review was collected as part of a promotion.] This has become my daily wear bra; I initially bought one to use for hiking, but liked it so well that I bought several to wear everyday.
Originally reviewed on icebreaker.com
September 8, 2025
Nice Bra
The fabric is nice for hiking and it has removable pads. I like the color and texture but I wish the straps were thicker and more like a sports bra. I wear this a lot and I will probably get it in another color.

Originally reviewed on ExpertVoice.com
September 6, 2025
Best outdoor activity bra!
This bra is highly recommended! I have been wearing it for hiking, skiing, backpacking, and long-distance travel and it performed well. It stayed fresh, even after six days of backpacking in New Mexico and 10 days of TMB . It's incredibly comfortable, supportive, and breathable.

Originally reviewed on ExpertVoice.com
September 5, 2025
Perfect!
[This review was collected as part of a promotion.] This is my go-to bra for everyday, camping and travel. It wears well, is very versatile and extremely comfy. I've used this bra for at least 10 years and own several.
Originally reviewed on icebreaker.com
September 5, 2025
My Go-To Travel and Daily Bra
The Siren Bra has been great for everyday wear and light support. It’s comfortable under a T-shirt and holds its shape well without digging in. The merino makes a big difference—I can wear it for multiple days and it doesn’t get stinky. It’s not designed for high-impact activity, but for daily use or travel it’s been a solid choice.

Originally reviewed on ExpertVoice.com
August 28, 2025
Great bra
[This review was collected as part of a promotion.] The merino wool fabric is very comfortable and wicks away sweat. Love my icebreaker clothes! I sized up to a large since the first icebreaker bra I owned was a medium and was a bit too snug. I typically wear 36b.
Originally reviewed on icebreaker.com
August 27, 2025
Flattering for a small bust
[This review was collected as part of a promotion.] This bra has a flattering fit and is such a pretty color. It pulls on, which is convenient, and looks nice under a t-shirt. The wool is a bit itchy, but I hope it softens with time.
Originally reviewed on icebreaker.com
August 27, 2025
Best bra ever
[This review was collected as part of a promotion.] I love this bra. I I initially held off from buying it because I thought the center seams would look funny under shirts, but I was wrong. This is the most comfortable bra I own. I love that it has a thin removable insert/pad for modesty. I actually bought the pink one as a second one after the first one I bought fit so well and felt so great.
Originally reviewed on icebreaker.com
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