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Siren Thong - Women's

4.760456273764259 out of 5 stars
263 Reviews


Size Chart


Why We Like The icebreaker Siren Thong

From the yoga studio to the trail, the icebreaker Siren Thong keeps us covered with merino wool's natural odor-fighting, sweat-wicking power while staying discreet under our tights.


  • Woolly thong to remove underwear lines from your activewear
  • Merino wool blend manages temp, moisture, and odor
  • Stretch construction moves with you
  • Item #ICE00HN
83% merino wool, 12% nylon, 5% Lycra
natural attribute of merino wool
casual, running, training
Manufacturer Warranty
1 year

Overall Rating

5 based on 263 ratings

Review Summary

1 Stars - 3 reviews
2 Stars - 1 reviews
3 Stars - 5 reviews
4 Stars - 38 reviews
5 Stars - 216 reviews

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.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

February 1, 2024

Favorite thong!

I've used it several times
Size Bought:
5' 6"

I have a hard time finding underwear I love - these are perfect and amazing. I came back to buy another pair! Fit great, don't dig into your hips, and the rise is perfect, not to high and not to low.

Kirstin K
5 out of 5 stars

April 26, 2023

Everything I Wanted

[This review was collected as part of a promotion.] Ticks all the boxes for all of the activities… hiking, running, camping, lounging, etc.


Originally reviewed on

5 out of 5 stars

April 18, 2023

Love it

(This review was collected as part of a promotion.) Perfect for everyday use, I love it! Great fit and very confortable to wear.

Chloe jp

Originally reviewed on

5 out of 5 stars

April 17, 2023


[This review was collected as part of a promotion.] I love the wicking capability of this underwear. I am very active and it does the job. It is also soft.


Originally reviewed on

4 out of 5 stars

March 16, 2023

My favorite underwear

This is my favorite underwear I have ever owned. I only own one but I have had it for over a year now and it’s the only underwear I want to wear. I work 24 hour shifts and three separate jobs that are very active and sometimes I get really busy between all of those things and I feel comfortable in these for way longer stretches of time than I do in any other underwear. Sometimes I end up not having a choice but to wear them for over 24 hours and it’s totally fine. I feel like with all of my other underwear it drives me crazy and I feel gross about halfway through the day and I feel like I need to change them. These keep their shape and size and are breathable and keep me feeling clean. They are just so comfortable. I would have more if I could afford them. I do have one issue that I hope Icebreaker can work on. The internal gusset could maybe extend a bit further forward. I find that it doesn’t quite extend as far as it needs to in order to have the coverage I need in that area. If that gusset extended maybe a 1/2 inch further it would be perfect and even more comfortable and effective. And of course I’d love to have more warm color options :)


Originally reviewed on

5 out of 5 stars

February 28, 2023

Love these undies!

These are perfect for sports. No odors. I don't feel them getting moist, really it's like not wearing any. So comfortable.


Originally reviewed on

5 out of 5 stars

February 25, 2023

New favourite undies

Exactly what I was hoping for! Comfortable and cute. If you are on the fence, buy them


Originally reviewed on

5 out of 5 stars

February 21, 2023

Lovely little things

(This review was collected as part of a promotion.) So comfortable! Almost forget you’re wearing them. Size up if you prefer a looser fit as they are quite snug, but that may be a personal preference as either M or L fit me well. For reference, I’m an S in the Merino 200 boy shorts, for example, but those fit slight larger for some reason. I’m a size M in the hipsters, however, I find the Icebreaker sizes really depend on the product and how you want it to fit.


Originally reviewed on

5 out of 5 stars

January 30, 2023


Extremely comfortable. You don't even feel as if you are weraring underwear.


Originally reviewed on

5 out of 5 stars

January 28, 2023

The best underwear. Ever.

Comfortable, breathable.... true to size. A great pair of underwear.


Originally reviewed on