Icebreaker Siren Base Layer Tank Top - Women's
The soft, stretchy Icebreaker Siren tank top is a highly functional layering top for any day of the year. Layer it over the Siren Bra and under any mid layer for enhanced breathability and comfort.




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- Core-spun fabric features soft merino wool fibers wrapped around a nylon core for added strength and durability, while retaining next-to-skin softness
- Lightweight yet durable and breathable fabric resists odors naturally
- Fabric blend also wicks moisture and dries quickly
- Scoop neck and slim fit offer a sleek look
- Icebreaker Siren bra sold separately
- Icebreaker will replace your garment within 1 year of purchase if it has been damaged by faulty fabric, stitching or manufacturing; see Icebreaker website for details
Imported.
View all Icebreaker Women's Tank TopsBest Use | Multisport |
---|---|
Fabric | 83% merino wool/12% nylon/5% Lycra spandex |
Moisture Wicking | Yes |
Quick Drying | Yes |
Sleeve Length | Sleeveless |
Gender | Women's |
2X | 3X | XS | S | M | L | XL | |
---|---|---|---|---|---|---|---|
Numerical Size | 0-2 | 4-6 | 8-10 | 12-14 | 16-18 | ||
Bust | 42 - 46 | 46 - 49.5 | 30 - 32.25 | 32.5 - 34.5 | 34.5 - 37 | 37 - 39.5 | 39.5 - 42 |
Waist | 36 - 40 | 40 - 44 | 24 - 26 | 26 - 28 | 28 - 30.5 | 30.5 - 33 | 33 - 36 |
Hip | 45 - 48.5 | 48.5 - 52 | 33 - 35.5 | 35.5 - 38 | 38 - 40 | 40 - 42.5 | 42.5 - 45 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated.
CHOOSING THE RIGHT SIZE: If your body measurements are midway between two sizes, select the smaller size for a tighter fit or the larger size for a looser fit. If your body measurements result in different sizes, we recommend using your chest measurement for tops and your hip measurement for pants.
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Completely sheer
I ordered this tank in the loden and grape colors and they are both see through. It doesn't matter what color bra I'm wearing, you can see it. I was hoping to wear these this summer but I'm afraid they won't work for that. Very disappointing!
Perfect!
[This review was collected as part of a promotion.] I wear sleeveless tanks practically all year, and for the past 2 years have worn woolen tanks. They're a great base layer that's effective without making me overheat or sweat, and the fabric is so soft that it feels like a luxury cotton. I love the thinner straps and the larger scoop neck because it allows me to wear it even with an open collar shirt. I wash it in a warm wash and (cover your ears, icebreaker) even dry it on low in the dryer, and it wears very well.
Love this!!!
[This review was collected as part of a promotion.] I absolutely love this base layer tank top! I'm maybe going through perimenopause (?) and am having random night sweats. I wanted to start sleeping in something that would be cozy and warm but isn't long sleeved or too heavy or would otherwise make the night sweats worse. This tank has been great! While it's high quality I do feel it is overpriced considering it's a tank top. I'll buy more when they're on sale.
I love everything I've purchased from Icebreaker
[This review was collected as part of a promotion.] I love this merino wool Icebreaker tank top. It fits great. It's easy to wash using a laundry bag with cold water and medium cycle. I wash all of my merino wool items together in the machine using numerous laundry bags since I have underwear, socks, undershirts, tanks, short and long sleeve tops, and even long pants. I love them all!
Great
[This review was collected as part of a promotion.] This a great tank. It's thin fabric though, so I bet some colors would be see through and it really is better for layering under another piece. I sized up to a large from a s-m for a looser fit and it was the right choice. It drapes and doesn't hug. I have a broad shoulders and a big rib cage for my size.
I'm gonna buy more in other colors
This top is pretty fitted. More like an XS size. I'm 5'-5", 114 lbs (32c) fir reference. I wear this top as an underlayee when if's cool, as a sleepwear, or as a top when it's warm. It's very versatile and plan to order more. I wash it in cold water (machine) and line dry it.
I love this top. I wore it over and over this winter underneath my base layers, as additional warmth for my core. It was a nice addition and helped with my layering system without adding a lot of bulk. I've been really happy with the quality of Icebreaker products!

I wish it was 100% merino
[This review was collected as part of a promotion.] I have a few of these tank tops and wear them to the gym. They work great. Maybe the straps are slightly too long (on the XS size). I wish they were 100% merino wool; they would be perfect then. Unfortunately, the threads aren't cotton! Please offer more colors!
Loved these!
These fit great and were a good base layer on a recent vacation where we encountered a range of temperatures and weather conditions. Added a bit of warmth, kept my tops fresher, and were great under sheer tops. I purchased them in black and praline.
Nice color
[This review was collected as part of a promotion.] I bought this for an undershirt and was suppressed at the size of it. Seemed smaller than usual (size M), but alright for wearing under other shirts. Kind of short too. It'll work, but a little less than expected.