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Details

  • 83% merino wool, 12% nylon, 5% Lycra
  • Naturally anti-odor
  • Low rise with full coverage
  • Item #ICE00HO

Why We Like The Siren Bikini Underwear

Quick—ring the alarm! Someone notify the comfort police that the Icebreaker Women's Siren Bikini Underwear is the new sheriff in town. Crafted with an ultralight merino wool combined with a touch of Lycra, these full coverage bikini undies put a practical and comfortable spin on your run-of-the-mill bikini silhouette with their low rise and full coverage. Additionally, merino wool naturally kicks unsavory odors out the door so you won't feel quite as stinky after having run 15 miles through the local trail system. 


Details

  • 83% merino wool, 12% nylon, 5% Lycra
  • Naturally anti-odor
  • Low rise with full coverage
  • Item #ICE00HO
Responsible Collection
Responsibly Sourced
Material
83% merino wool, 12% nylon, 5% Lycra
Cut
hipster bikini
Anti-Odor
natural attribute of merino wool
Manufacturer Warranty
1 year

Overall Rating

4 based on 41 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 2 reviews
3 Stars - 4 reviews
4 Stars - 2 reviews
5 Stars - 29 reviews

Fits True To Size

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.
Runs smallTrue to sizeRuns large

Customer Images

Here's what customers have to say

The reviews indicate the underwear is generally well-received. Customers praise it for being comfortable, breathable, and odor-resistant, making it suitable for everyday wear and activities. Key positives include soft, lightweight fabric, excellent breathability and moisture-wicking, odor-resistance, quick-drying, and flattering design. Some noted the coverage is a bit skimpy and the sizing runs small, while a few found the tags irritating. Overall, the majority of reviewers are highly satisfied and recommend the product.

AI-generated from the text of customer reviews.

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5 out of 5 stars

July 6, 2025

Best backpacking underwear

[This review was collected as part of a promotion.] I'm hiking the Colorado trail on a thru-hike and these are the most comfortable, odor resistant underwear. Highly recommend them!

Jonsey
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

June 28, 2025

Excellent purchase

[This review was collected as part of a promotion.] I've worn these on several trail runs and am in love. They are so lightweight I forget I'm wearing them. They do offer less coverage than some styles, but I personally like that and appreciate that it's a smaller cut but not a thong. For reference I bought a size small and I'm a 26-27 waist/size 2-4. Five stars, definitely ordering more. And the purple color is beautiful.

April
icebreaker.com

Originally reviewed on icebreaker.com

1 out of 5 stars

June 18, 2025

Sizes have gotten smaller

[This review was collected as part of a promotion.] I've bought the same underwear in the past same size and this time around it appears the measurements have at least an inch missing in fabric/waistband compared to my other size small.

user image
Steph
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

June 17, 2025

Fantastic

[This review was collected as part of a promotion.] If you're on the fence about these, go for it. They're so light and comfy, and very flattering. They are a little low cut, so if you're between sizes I'd size up. These are so much better than the competition I've tried, it's not even a contest.

Alex
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

June 15, 2025

A lifelong customer

[This review was collected as part of a promotion.] Ice breaker underwear are by far my favorite. They are soft and breathable. They meet the needs of an active lifestyle. They aren't necessarily as durable as cotton but I feel good about the material sourcing.

Alex
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

June 14, 2025

These are the best undies

[This review was collected as part of a promotion.] These are my favorite underwear. I have several pairs in different colors and I love them.

MM
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

June 14, 2025

Great product

[This review was collected as part of a promotion.] Fits well, very comfortable. Looks good and very functional. Really great for backpacking, hiking and outdoor activities. I would buy this again.

backpacking gal
icebreaker.com

Originally reviewed on icebreaker.com

5 out of 5 stars

May 14, 2025

my favorite!

These have held up SO WELL! From handwashing on a through hike to wearing daily for my job. I will be buying many more. Thank you icebreaker for making quality products that work!

Leah J
ExpertVoice.com

Originally reviewed on ExpertVoice.com

5 out of 5 stars

April 28, 2025

Best Underwear Ever

Great comfortable versatile underwear. Love them when I’m being active just as much as I love them for hanging around. No wedgies, elastic keeps it in place while not being annoying. I’m slowly trying to replace all my undies with these.

Brooklyn N
ExpertVoice.com

Originally reviewed on ExpertVoice.com

5 out of 5 stars

April 22, 2025

My go-to for travel

These are the underwear I consistently reach for when I travel. They are lightweight, breathable, and stay funk free. I can wash them and hang to dry at night, and they are ready to go the next day. I've tried merino wool underwear from other brands, but these are the best, IMO - I find compared to the other brands they are more breathable, dry more quickly, and last a lot longer. Another high quality product from Icebreaker!

Jennifer D
ExpertVoice.com

Originally reviewed on ExpertVoice.com