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"Was skeptical at first buying wool blend underwear but these are great. I was unsure of the sizing but the information in the size chart was accurate and worked for me"
Free standard shipping for orders above 630 DKK
Free returns
299,00 kr
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299,00 kr
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.
Slim Fit
A snug, close-to-body fit for low bulk layering.
Standard delivery: free for all order over DKK 630. Delivery in 2-3 days, from Monday to Saturday, during working hours.
Express delivery: receive it in 1-2 days
Please visit our Delivery page and find out more about the ways in which you can receive our products.
You have 30 days from delivery to follow our quick and easy return procedure.
Overall rating: 4.763224 / 5 from 397 reviews.
The 150 Siren Thong is praised for its ultra-comfortable and stretchy design, featuring a merino wool blend fabric that offers durability and softness. Customers appreciate its flattering colors, great quality, and perfect fit. The thong is also noted for its breathable and comfortable fabric, making it suitable for various activities.
Review topics: ["fit","size","delivery","price","quality","design","feel","problem","material","looks","fabric","colour","comfort","wear","band","underwear","medium","style","weather","thong","waist","speed","workmanship","undies","moisture","gusset","buy","smell","wool","tags"].
"Was skeptical at first buying wool blend underwear but these are great. I was unsure of the sizing but the information in the size chart was accurate and worked for me"
— Kaila (4/5)
"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)
"Gusset is large enough to fit her! Super soft and stretchy, which is a quality not every wool underwear brand has. Love the color and fit of the siren thong."
— Shelly (5/5)
"My absolute favourite underwear. They wash really well and still look new after many washes. They dry quickly and are great for travel."
— Susan T. (5/5)
"Very comfortable for exercise and daily use. I will be purchasing more!"
— Becca (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)
"I now have 5 pair of these - my absolute favorite. Soft comfortable merino fabric against your skin that breathes, flat smooth waistband that doesn't show through yoga pants, and perfect fitting. TTS"
— Marla B. (5/5)
"Very breathable and comfortable, even when sweaty! Doesn't cling like my synthetic fabric thongs, nor hold onto the sweat like my cotton thongs tend to do. The seams are a bit bulky for my taste, but I'm hoping that means they will be durable over time."
— Alex T. (4/5)
"Most comfortable thongs ever. I wear them under gym leggings and they don’t ride up or show through the material. Breathable and easy to wash. Love them"
— Angeline E. (5/5)
"I have tried numerous different merino thongs from multiple companies looking for the perfect fit. This is the one!!"
— Matt M. (5/5)
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 | 33-35.5 | 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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