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$60.00
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$60.00
Our best-selling bra with a comfortable and lightly supportive fit, the Siren Bra features our 150gm jersey corespun fabric, which uses merino wool fibers wrapped around a nylon core for added strength and durability, while retaining next-to-skin softness. We've added a touch of LYCRA® for active stretch. The Siren’s sleek design and no-side-seam construction is perfect for everyday comfort and easy layering, while its thin adjustable elastic straps make for a barely-there feel.
Good for:
83% Merino Wool/ 12% Nylon/ 5% Elastane, Exclusive of decoration
Machine wash warm. Wash inside out with like colors. Do not use softener. Do not bleach. Do not tumble dry. Line dry in shade. Warm iron. Do not iron print and accessories. Do not dry clean.
Fit
Slim
Overall rating: 4.445669 / 5 from 1270 reviews.
The Women's Merino 150 Siren Bra is praised for its great fit, soft and breathable fabric, and comfortable feel. However, opinions vary on the cups, straps, band, padding, and support. Customers also appreciate the variety of colors available.
Review topics: ["fit","size","delivery","price","weight","quality","feel","problem","looks","material","band","bra","fabric","straps","padding","support","wear","comfort","shape","cups","medium","design","weather","colour","style","top","model","buy","layer","construction"].
"Purchased two of these bras in May of 2026 and have worn each no more than ten times. I've washed by hand and hung to dry. Already, the elastic band is showing signs of wear with the elastic kinda breaking apart in the gray one (black one looks fine). Very disappointed in the quality. Bought a medium and I am 4'11"/110 lbs."
— Liz (2/5)
"Finding a merino bra that has a good fit and that is also comfortable has been a challenge but this 150 Siren bra delivers well in all areas. The fit is nice with good coverage and adjustable shoulder straps. It has low/medium support which is what I was looking for in this type of bra. My only suggestion where it has room for improvement is the removable pads. I do like the option to have pads that are removable, however the pads that come with this bra have an awkward texture/shape to me that doesn’t give a smooth look. So I will most likely be wearing without the pads or replacing with a different set of pads. Overall I’m very pleased with this bra and would recommend."
— Valerie (5/5)
"The sizing chart made getting the right fit easy. My recommended size medium is snug under the bust without being tight and I forget I am wearing it. I like the front positioned strap adjustment. The plunge style does offer a challenge in keeping things in place when active. I took away one star for this."
— AJD (4/5)
"I've bought these bras for years and like the wool. I put up with the wrinkly top of the cup area and wish that would get fixed. But I can't use the padded inserts. I'm 34 AA/AAA and they are too big and round for my breasts. I like a pad sometimes so use ones from a bathing suit that are lighter and smaller. Others have commented on this too - please consider a redesign! And for reference I find the Small to be the right size for me given the 34" band. Last comment to Icebreaker - consider sewing all the labels on with separate thread, as you do for the underwear! It's easy to cut that thread and remove the whole label on the underwear without having all the extra in the seam, as there is on the bra, and for that matter, the t-shirts. We all get rid of the labels - make it easier for all the clothes, since you do it for underwear!"
— Pat (4/5)
"I love it ! It is very comfortable.. i already had black ones and they stay in great condition as time goes by. Machine wash and hang up to dry is easy maintenance."
— Slime (5/5)
"Toujours aussi confortable. Les sous vêtements mérinos sont une première première couche parfaite été comme hiver. Le choix de couleurs varie selon les saisons, parfait pour ajouter à ma collection."
— M (5/5)
"Very nice design! For a lot of tank top, this time just look invisible! Surprisingly easy to wear! was a bit worried it will not be that supportive~ but now I am very tempted to just collect multiple sets of this item!!! and it's underwear!!!"
— Sera (5/5)
"Great for hot weather and hot flashes. Pack for recent road trip. Dried fast. Nude color great for white tops. Very comfy."
— TreeYoga (5/5)
"I have several of these bras and they are great! I’m a huge fan of wool and they are my every day work bras. Fairly comfortable and low profile, don’t make me feel smashed like sports bras. You can wear them multiple times between washes. I bought this one because all my others were black and needed a nude color under a bridesmaids dress."
— Hannah H. (5/5)
"I’ve worn these bras for years and still love them. They last well and are really comfortable. This color is great under white t shirts. This is the first I bought that came with the inserts which I was excited about until I tried it on and found that the inserts are too big for my small cup size, so I don’t use them. Still a fabulous bra."
— SSS (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.
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Bust | 30-32 | 32-34 | 34-37 | 37-40 | 40-42 | 42-45 |
| Arm length | 30 | 30.25 | 30.5 | 30.75-31 | 31-31.25 | 31.25-31.5 |
| Waist | 24-26 | 26-28 | 28-30 | 30-33 | 33-36 | 36-39 |
| Hips | 33-35.5 | 35.5-38 | 38-40 | 40-42.5 | 42.5-45 | 45-48.5 |
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Bust | 76-82 | 82-88 | 88-94 | 94-100 | 100-107 | 107-116.5 |
| Arm length | 76-76.5 | 76.5-77 | 77-77.5 | 78-78.5 | 78.5-79 | 79-79.5 |
| Waist | 61-66 | 66-71 | 71-77 | 77-84 | 84-91 | 91-101 |
| Hips | 84-90 | 90-96 | 96-102 | 102-108 | 108-114 | 114-123 |
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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