Tried numerous brands and these are the best by far!
"Super comfortable and soft. Really love these and the fit is flattering too. Ordered other wool thongs from other companies and these are the best! Will definitely buy more!"
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$35.00
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$35.00
This item's price has been updated recently to ensure you get the best value.
Last priced at -
A stretchy, ultra-comfortable thong for minimalist comfort, the Siren Thong features our corespun merino wool blend fabric for durable, super-soft performance during active or casual use.
Good for:

83% Merino Wool/ 12% Nylon/ 5% Elastane, Exclusive of decoration
Machine wash cold gentle cycle. Wash with like colors. Do not use softeners. Do not bleach. Do not tumble dry. Line dry in shade. Cool iron. Do not iron print. Do not iron decoration. Do not dry clean.
Model measurements
Height: 179cm / 5'10". Waist: 62cm / 24". Anya is wearing size S.
Fit
Slim
Overall rating: 4.747692 / 5 from 325 reviews.
The Women's Merino 150 Siren Thong is praised for its ultra-comfortable design, high-quality fabric, and flattering colors. Customers appreciate its perfect fit and soft feel, though some noted issues with the gusset size and liners.
Review topics: ["size","fit","fabric","problem","material","quality","feel","colour","design","looks","comfort","packs","wear","band","medium","pants","weather","speed","waist","underwear","moisture","style","texture","thong","buy","tags","pair","liners","wool","cut"].
"Super comfortable and soft. Really love these and the fit is flattering too. Ordered other wool thongs from other companies and these are the best! Will definitely buy more!"
— Jenn (5/5)
"Very comfortable for exercise and daily use. I will be purchasing more!"
— Becca (5/5)
"As I switch from synthetic to natural fibers I have tried many brands for underwear and Icebreaker is a favorite. True to size . These are low rise for sure but I like the fit."
— Anonymous (5/5)
"These are perfect. I use these for running and skiing, the cut is excellent and the merino obviously helps with all day sports comfort."
— Angela (5/5)
"Love these! I always wait for a sale because they're pricey but this is my fourth pair over the last 2-3 years and they're all still going strong."
— Lauren M. (5/5)
"The rise of the underwear is low. Think early two thousands jeans. Otherwise pretty comfortable if you don’t try to give yourself a wedgie."
— Starlight K. (3/5)
"Great thong that doesn't dig in"
— Olga G. (5/5)
"I've tried a different brand of merino underwear and this one was much more comfortable. Thin, breathable, with a higher percentage of merino. I'm usually an XS but purchased a small based on reviews. It fits well, but I'm wondering if I could have tried an XS. Either way, I love it! Would love to see boy shorts in the beige colour also. I agree that the gusset could be longer."
— AK (4/5)
"I brought a couple pairs of these into the backcountry for nearly two weeks, they were insanely comfortable during strenuous hiking and a quick rinse refreshed them so I could wear again, and they continued to smell and feel fresh the whole trip!"
— Jen (5/5)
"My partner really wanted to like this product; however Icebreaker's Siren series is prone to losing its shape and thinning out. This is annoying considering the price and ruins the comfort rating. I'm not sure how long they will last. On the good side they were initially comfortable."
— Anonymous (3/5)
Find the size that fits you best based on people just like you.

Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different sizes, order the size indicated by your chest measurement for tops and your hip measurement for pants.
Sizing charts:
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Waist | 24-26 | 26-28 | 28-30.5 | 30.5-33 | 33-36 | 36-40 |
| Hip | 33.5-35.5 | 35.5-38 | 38-40 | 40-42.5 | 42.5-45 | 45-48.5 |
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Waist | 61-66 | 66-71 | 71-77 | 77-84 | 84-91 | 91-101 |
| Hip | 84-90 | 90-96 | 96-102 | 102-108 | 108-114 | 114-123 |
*Looking for the inseam length? Please refer to the product page to find out.
Our three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.



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