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The perfect fireside cuddle top.

A soft merino wool construction with just a touch of Lycra for extra stretch, the Icebreaker Women's BodyFit 150 Siren Sweetheart is that comfortable, slimming long-sleeve top you've been looking for as a baselayer under sweaters and for those cold winter nights when you're cuddled up next to your fireplace. Icebreaker's lightest weight merino naturally regulates your body temperature and deals with odor.

  • Merino wool
  • Slim fit
  • Sweetheart neckline
  • Set-in sleeves
  • Blizzard heather option features artwork by Simon Beck

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Here's what others have to say...


Wife (almost) cried when she lost it

  • Familiarity:I've put it through the wringer

My wife and I hiked the Napali Coast trail in pretty much a constant downpour. She wore this shirt for the whole two-day trip and said it was the perfect piece to have with her while we braved the elements... My wife has been eagerly waiting for this shirt to get back in stock since she discovered that she left hers Kauai. Oops.

Be warned that the fabric of this shirt is THIN, but that's actually the main reason my wife says she loves it. It can work as a very light single-layer, or a versatile base-layer to put warmer layers on top of... She also says she likes the neckline because it is a lot more flattering than a traditional crewneck.


A versatile wool base

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:Runs small

I was looking for a merino wool base layer that I could also get away with wearing out to dinner, this top works for both. I like the wider neck and cut of the top. I got the black in medium, like most icebreaker tops I would say it runs small as I am often a small. I have no issues with the wool itching. I want to order the other colors!

Toasty warm and lightweight!

Toasty warm and lightweight!

Picking up some Christmas presents after a quick hike to the top of Mount Bailey in Bailey, Colorado! This top dried quickly and layered effectively for comfort in the field AND while shopping! Bonus!


Great for activity or everyday!

  • Gender:Female
  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

I'm a sucker for a good thin long sleeved layering shirt, and the fit of this one was great! I tried this out while playing disc golf in dry 37-40 degree weather on a windy day. I wore it as my bottom layer under a fleece and a shell and it stayed put and didn't ever ride up! I like the longer length of the shirt and the longer sleeves that go past my wrists. I'm 5'6", 125 lbs, a B-cup, and the small fits perfectly! My only issue was that it was a tad bit itchy at the crease of my elbow, but I'm hoping that will stop after a few washes!


Get it, Got it? GOOD!

  • Familiarity:I've used it once or twice and have initial impressions

So I haven't yet taken this baby out on a ski tour yet since its not winter. However I have worn it on some cold fall nights and it does awesome! It was stiff at first but giving it an initial wash really helped. Climbing outside in this shirt is perfect for those cold fall days in the mountains. This top would do well camping and hiking as well. It not only kept me warm but dry and that is always super important especially when dealing with the cold. Not only does it have outdoor uses it can be worn as a casual piece as well. Paired with some cute jeans you can totally rock this at a get together. The fit is super cute and slimming. I'm 5'4" 120lbs and the size Small is perfect. If you want it to be "to the skin" I would suggest getting the XS. I highly recommend this top to the ladies out there who are looking for an awesome base layer for the fall/winter. I look forward to using it in the winter and will update my review when I fully test drive this top out.