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  • Icebreaker - Siren Bikini Underwear - Women's - Black/Black
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  • Icebreaker - Siren Bikini Underwear - Women's - Ice Blue/Oxblood/Stripe
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  • Icebreaker - Siren Bikini Underwear - Women's - Black/Black
  • Icebreaker - Siren Bikini Underwear - Women's - Black/Snow/Stripe
  • Icebreaker - Siren Bikini Underwear - Women's - Eggplant/Silk Heather/Stripe
  • Icebreaker - Siren Bikini Underwear - Women's - Fawn Heather/Fawn Heather/Fawn Heather
  • Icebreaker - Siren Bikini Underwear - Women's - Gritstone Heather/Black
  • Icebreaker - Siren Bikini Underwear - Women's - Ice Blue/Oxblood/Stripe

Icebreaker Siren Bikini Underwear - Women's

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    • Black/Black
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    4.5513

    13 Reviews

    Details

    Quick—ring the alarm! Someone notify the comfort police that the Icebreaker Women's Siren Bikini Underwear is the new sheriff in town. Crafted with an ultralight merino wool combined with a touch of Lycra, these full coverage bikini undies put a practical and comfortable spin on your run-of-the-mill bikini silhouette with their low rise and full coverage. Additionally, merino wool naturally kicks unsavory odors out the door so you won't feel quite as stinky after having run 15 miles through the local trail system. 

    • 83% merino wool, 12% nylon, 5% Lycra
    • Naturally antimicrobial
    • Low rise with full coverage
    • Item #ICE00HO

    Tech Specs

    Manufacturer Warranty
    1 year
    Recommended Use
    casual, hiking, running, skiing
    Anti-Odor
    yes, natural attribute of merino wool
    Cut
    hipster bikini
    Material
    83% merino wool, 12% nylon, 5% Lycra

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Great Undies!

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: Small
    • Height: 5'6"
    • Weight: 140lbs

    Love the fit of this bikini relative to other outdoor brands since this fits like a TRUE bikini and narrows in at the sides. If you have a little bit of booty I would recommend sizing up as the seaming is a little tight around the bum. Fabric and style is on point though!

    great product - runs small

    • Familiarity: I returned this product before using it
    • Fit: Runs small
    • Size Bought: Small
    • Height: 5'4"
    • Weight: 130lbs

    These undies are great, but I did have to return them for the right size as I found that they run smaller than the normal size I would wear. First ordered a small and had to return for Mediums.

    Wool that your Granny would Love

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: medium
    • Height: 5'4"
    • Weight: 120lbs

    These come in a little box that say "Wool with Sex Appeal" but i did not feel sexy in these. They were awkwardly narrow in the crotch and covered way too much of my butt.... I honestly felt like they were an updated granny panty.
    Maybe my figure just inst made for these but they are now shoved in the back of my dresser and will probably only be used for when Aunt Flo comes around.

    Born in Nature

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Small
    • Height: 5'1"
    • Weight: 118lbs

    These are some super comfy undies for hiking and camping. Dries fast and resist odors. Order a few of these and you will love them. The fit was great. I was worried they were going to be too big but they fit perfectly.

    I usually wear an XS or S. I ordered a Small in these.

    The waist size in inches:
    XS (24-26) S (26-28) M(28-30) L(30-32) XL (32-35)

    Honest and open review

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: small
    • Height: 5'4"
    • Weight: 125lbs

    I was really excited to try these out. I love everything Icebreaker makes so I was really excited for some fancy panties. But... the crotch is really narrow and doesn't cover much. You can kind of see it in the pictures above, in the pictures of the pink and green ones. The piece that goes between your legs, it's really tiny! I was hoping for undies I wouldn't even notice I was wearing. My coworker said she had the same problem. Besides that they're very soft and the waistband is very comfortable.

    Happy Butt, Happy Hiking

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: medium
    • Height: 5'6"
    • Weight: 140lbs

    I have strong opinions about underwear. When you're hiking up a mountain pass, through thick willows, with an 80 pound pack on your back, then very last thing I want to deal with is a wedgie. Thank goodness for the Icebreaker Siren Bikini underwear.

    I brought along one pair of these glorious underoos on a backpacking expedition last summer. I was keen on wool for how it holds up over time and also helps about stink. The Siren Bikinis held their shape magnificently over the six weeks in the tundra, washing at resupplies and wearing about every three or so days.

    I was incredibly impressed with how these held up over the expedition--barely any sign of wear upon return, and they're still my go-to pajama bottoms.

    Everyday choice

    • Height: 6'1"
    • Weight: 180lbs

    My wife is a huge fan of the Icebreaker Siren underwear. They are extremely good at wicking and stay comfortable all day.

    The one downside, as with other Merino Wool, is that the durability is less than would be desired. Hers have formed holes within the first 12-18 months. But she likes them enough to keep buying them anyway!

    Great underware

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: xl
    • Height: 5'1"
    • Weight: 155lbs

    I got these for backpacking and they are great. I will be wearing them all the time. They dried quickly when washed and when being worn. They didn't stink either which was amazing.

    Super comfy

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Medium
    • Height: 5'4"
    • Weight: 133lbs

    I've used these on a couple of weekend backpacking trips so far and they've been great! Very lightweight, comfortable and they don't ride up like typical bikini underwear do (for me anyway). I'm average weight and carry my weight in my hips and legs so the medium fit perfectly.

    Comfortable, quick-drying

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: Large
    • Height: 5'1"
    • Weight: 140lbs

    I bought a pair of these for my Appalachian Trail Thru-Hike. They lasted the whole way - over 2,000 miles of walking in them over 6.5 months.

    They are extremely comfortable and always stay in place, even while walking long distances with a heavy backpack on. They are definitely odor-resistant, and one of my favorite features of these (and most merino) is the quick-drying. I was able to wash these in the morning, and a few hours later (or less), they'd be dry.

    After my thru-hike, I loved them so much, I bought 2 more pairs. The only reason I am giving these 4 instead of 5 stars is because these second 2 pairs have not been durable. One pair is burning a hole in the crotch, and the other pair ripped at the top seam.

    Lightweight and built to stay in place!

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Small
    • Height: 5'4"
    • Weight: 130lbs

    These underwear are very comfortable to wear. The material is soft and comfortable for a variety of activities. I have been wearing them when I hit the slopes and even then, they will stay in place. They don't have the "granny panty" look or feel, so I'm a huge fan! I got these in a size Small, I'm about 130 lbs with an athletic frame and they fit great!

    Love!!

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Medium
    • Height: 5'5"
    • Weight: 130lbs

    Super nice! Seriously feels like you are wearing nothing, these are the perfect fit and they stay in place. A great underwear for multiple activities as well- sometimes bikini cut can feel like diapers but not these, very flattering and functional. Enjoy.

    Magic Merino!

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: Medium
    • Height: 5'7"
    • Weight: 120lbs

    I have been an Icebreaker fan for years, but was never brave enough to try their underwear until recently and I shouldn’t have waited this long! These underwear might not look like much in the picture but the merino blend makes them SO comfortable and light weight! Plus the updated bikini cut is flattering on my back side while still providing enough coverage. I am definitely a believer in the magic of merino underwear and will be getting these in every color. Worth every penny!