Built for changing conditions.
Shop HikingComfortable!
"These are my favorites. I'm hoping to eventually replace all my non-wool underwear with the wool ones."
Shipping in 3-5 business days
Free shipping on orders over $99
$59.99
Enter your email to receive a notification when this product becomes available.
Kind reminder: You are viewing this product page on the New Zealand site, with prices shown in NZD.
Comfy underwear bottoms for everyday wear, the Merino 150 Siren Hipkini features our lightweight corespun merino jersey fabric that’s stretchy, naturally odour resistant, and soft next to your skin.
Good for:

83% Merino Wool, 12% Polyamide, 5% Elastane; Exclusive Of Elastic
Machine Wash Warm. Wash With Like Colors. Do Not Use Softeners. Fasten All Closures To Wash And Dry. Do Not Bleach. Do Not Tumble Dry. Line Dry In Shade. Warm Iron. Do Not Iron Print, Trims And Accessories. Do Not Dry Clean.
Model measurements
Height: 179cm / 5'10". Waist: 62cm / 24". Anya is wearing size S.
Key product measurements
Height: 24.4cm (based on size S); Width: 31.5cm (waist width, size S)
Fit
Slim
Join nature.rewards, icebreaker’s loyalty program.
Unlock thoughtful gifts, free delivery, and members-only discounts all year long.
Merino wool neutralizes unpleasant odors by absorbing odour molecules into its fibers, making them less detectable by the human nose.
Merino fibers efficiently manage moisture, absorbing it from your skin and releasing it into the atmosphere. It can absorb up to 35% of its weight in water without feeling wet.
icebreaker merino wool garments undergo special anti-shrinkage treatment, helping to resist deformation and pilling.
The thermo-regulation properties of merino wool adapt to your body and external conditions, so you can stay warm in the cold and cool in the heat.
Overall rating: 4.764026 / 5 from 606 reviews.
The Women’s Merino 150 Siren Hipkini is praised for its comfort, fit, and quality. Customers appreciate its soft and durable material, as well as its ideal coverage for everyday wear. However, sizing feedback is mixed, with some recommending a smaller size.
Review topics: ["fit","size","delivery","problem","weight","quality","feel","service","looks","material","comfort","underwear","fabric","style","wear","buy","cotton","medium","model","colour","results","weather","shape","hipkini","design","band","movement","briefs","stretch","threads"].
"These are my favorites. I'm hoping to eventually replace all my non-wool underwear with the wool ones."
— Jennifer (5/5)
"These are nice quality. Unfortunately just a bit loose so I will save them for when my weight fluctuates up."
— SSS (5/5)
"I originally bought the siren bikini & I loved the comfort and feel, they were just a tiny bit low waisted…. I then decided to try out the siren hipkini and what a world of difference. They are so soft and comfortable & very breathable! They don’t trap scent and I feel fresh even after wearing them for a day of hard work!!!!"
— tyler (5/5)
"I have been buying the 150 Siren Hipkini since 2021. I love them as they are so comfortable. They last for years if you take care of how you wash them. I am 5'2 and weigh 116 LB. I bought the small. It is very nice to wear natural fibres, particularly when going on long hikes."
— Katy C. (5/5)
"I'm slowly switching most of my underwear drawer over to wool. These aren't my favorite but mostly because I'm not as big of a fan of the cut as some of my other pairs. They're comfortable and soft and like all merino they do a good job with odor and moisture control. I would definitely get more of them."
— Anonymous (5/5)
"The best, almost 100% merino. Comfortable."
— Jane (5/5)
"Great underwear and super comfy. I am a 38" hip and since these are low waisted, I opted for a M which means no digging in anywhere and a little more length so they are not super low waisted on me. I am someone who is really sensitive to elastic being even slightly constricting, and with these, I forget I have them on!"
— Irene (5/5)
"Still very comfortable but wish Icebreaker hadn’t added a bright yellow permanent tag inside. Seems unnecessary and kind of undermines a purpose of light-toned underwear. This same underwear style from a year ago doesn’t have this label."
— Laura P. (4/5)
"Comfortable and good quality"
— Anonymous (5/5)
"Perfect underwear. Feels silky. Doesn’t hold moisture. Looks great. The only underwear I’ve worn for years."
— Nancy B. (5/5)

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 | |
|---|---|---|---|---|---|
| Waist | 24-26 | 26-28 | 28-30.5 | 30.5-33 | 33-36 |
| Hip | 33.5-35.5 | 35.5-38 | 38-40 | 40-42.5 | 42.5-45 |
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Waist | 61-66 | 66-71 | 71-77 | 77-84 | 84-91 |
| Hip | 84-90 | 90-96 | 96-102 | 102-108 | 108-114 |
*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.



Find the size that fits you best based on people just like you.

get 10% off
Sign up to icebreaker’s nature.rewards loyalty programme, and get early access to our upcoming event.
Check your inbox for an email from us containing your 10% off promotional code.
Success! 🎉 You've successfully signed up for our email list. Stay tuned for exclusive offers, updates, and more!
You are already set to receive the latest offers and news.