How to Choose Base Layers
Icebreaker Siren Sweetheart Long Underwear Top - Women's
$85.00
Members get an est. $8.50 in rewards
Ideal for year-round use in traveling, hiking or relaxing after a big day outside, the Icebreaker Siren Sweetheart top is soft and stretchy with an updated fit and fabric that make it even more comfy.
- Corespun fabric: soft merino wool fibers are wrapped around a nylon core for strength and durability, while retaining next-to-skin softness; Lycra® spandex adds stretch
- Updated with an improved fit over last season
- Sleek design and a flattering neckline for everyday comfort and layering
- 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 Base Layer Tops| Best Use | Casual |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 83% merino wool/12% nylon/5% Lycra spandex |
| Moisture Wicking | Yes |
| Underwear Weight | Lightweight |
| Sleeve Length | Long Sleeve |
| Gender | Women's |
Icebreaker Clothing - 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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Triana
Cayucos, CA, United States
Can't take it off
7 years ago
I love this shirt!! I honestly have been wearing it almost every day this winter. Perfect for hiking or just an everyday shirt to keep you warmer. Stylish and comfortable! I ordered XS I'm about 5'4' 115 pounds
Yes , I recommend this product
Nsb
Fairway, KS
Beautiful alone, and warm under a sweater.
6 months ago
[This review was collected as part of a promotion.] I put this on first thing every single day in the winter and cooler days in fall and spring. The fabric is silky and soft, and the neckline is VERY flattering. It looks great alone or under a jacket or shirt. The v-neck is wide enough to wear under virtually any sweater and not show, even wide necklines. But the very best thing is that it adds a bulletproof layer of warmth in cold weather. It fits snugly, and doesn't allow any cold air to get to my body. Because the wool breathes, I don't overheat, but never feel cold. I own many, and have gifted them to friends who find them just as perfect as I do!
Yes , I recommend this product
Originally posted on icebreaker.com
SicilySue
Atlanta, GA
Siren tees are perfect for everyday wear
7 months ago
[This review was collected as part of a promotion.] I purchased this top to replace one that is several years old that had gotten a couple of moth holes. The fabric is a bit more substantial than it was then, but is still the lightest weight underlayer I own. The fit is still form-fitting enough to easily wear as an underlayer without it feeling bulky. Love the low, broad neckline, too - it makes a nice cami-like scoop for peeking out from under the top of button-up shirts. I have a couple of these in the short-sleeve style as well. I love that Icebreaker offers products like this one that are flattering and feminine and suitable for everyday wear.
Yes , I recommend this product
Originally posted on icebreaker.com
Nsb
Kansas
Love it! Please make in larger sizes!
4 months ago
I have several of these, and love the fabric, and deep neckline. I wear them under sweaters in winter, and sometimes on their own in spring and fall. However, I can only wear them when I'm extra thin. I have broad shoulders, muscular arms, and a substantial bust, and much of the time, the XL is too tight. I see that you're making a few items in larger sizes. Please make this one in sizes larger than XL! I would live in it! Thank you. P.S. Also, please make the Siren Cami in larger sizes. Such a useful piece.
Yes , I recommend this product
Originally posted on icebreaker.com
Ruthanne A
4 months ago
Very flattering and feminine cut. It's great at wicking moisture and drying quickly. It's versatile - I use it both as a base layer under sweaters and as a stand-alone piece. I usually wear a small and it does fit but is very snug. I would probably size up to a medium if I had it to do over.
Originally posted on ExpertVoice.com
Phily from Woodinville
Seattle, WA
The newer cut of the siren doesn't work. Tight arms&too long
1 year ago
[This review was collected as part of a promotion.] I had an Icebreaker siren from years ago, which I love and it still fits great; it's a small. The new sizing is far too tight in the arms (??) and squeezes the torso hard. Too long in the body. I purchased a small and medium to test the new siren sizing, and both fit far too tight.
No, I do not recommend this product
Originally posted on icebreaker.com
Susan M.W.
Seattle, WA
Super fab layer. Cozy and glam.
11 months ago
[This review was collected as part of a promotion.] Cozy and soft: love the V neck and extra long sleeves. Perfect layering addition to be ever expanding Icebreaker collection. White color adds a glam factor to the style. Hike to tent to dinner.... Five bright stars and complements to the Icebreaker team. You "rock"!
Yes , I recommend this product
Originally posted on icebreaker.com
Hikerchik
Walland, TN
I have this one on right now!
9 months ago
[This review was collected as part of a promotion.] IB has the best quality merino clothing and this top is not exception to that rule. It is soft and comfortable, great for a cool morning walk or to layer under other pieces on a colder day. I am acquiring a closet-full of IB merino!
Yes , I recommend this product
Originally posted on icebreaker.com
Tina
Alaska
Great Piece
8 months ago
Ordered the navy and undyed (off-white). Undyed is see-through and a warm off-white. Navy is opaque. Wish 3-pg, big tag was not sewn into seam! I'm 5'4", 120 lb., A cup - this is upper limit for XS.
Yes , I recommend this product
Originally posted on icebreaker.com
worldexplorergirl
Seattle, WA
The fit is great but the fabric is way too sheer
5 months ago
[This review was collected as part of a promotion.] I did not keep this one, the fit and color is great but much too sheer for a woman my age. I own lots of icebreaker tops and the siren's have such a flattering fit, but stick to the darker shades.
No, I do not recommend this product
Originally posted on icebreaker.com
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