REI Co-op  Merino Bikini Underwear - Women's

$27.95
Members get an est. $2.79 in rewards

Stay comfortable on the trail in this naturally breathable and odor-resistant REI Co-op Merino Bikini Underwear. It's durable and soft for an all-day hike or just lounging at camp.

Color: Odyssey Gray
please select a Size
Fits slightly large based on reviews
Quantity
Select size for delivery dates

Members get an estimated $2.79 (10%) back on this item as a part of your annual .

Members get an estimated $2.79 (10%) back on this item as a part of your annual .
To buy,  sign in as an REI Co-op Member or join now.

Features

  • Bikini has a higher rise and slightly more coverage in back compared to our Hipster underwear
  • Ultrafine 150 g (17.5-micron) core-spun nylon is wrapped in merino wool and blended with TENCEL™ to offer the ultimate combination of durability and next-to-skin softness
  • Merino wool regulates body temperature, manages sweat, dries quickly, naturally resists odor and has 4-way stretch for ease of movement
  • Pill- and snag-resistant for durability
  • Soft elastic waistband and trim leg openings hold underwear in place during movement
  • Side seams shifted forward to maximize comfort
  • Machine wash warm, wash with like colors, on gentle cycle; use wool wash product; do not twist or wring; remove promptly; do not bleach; tumble dry low
  • Made in a Fair Trade Certified™ factory
  • REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world

Imported.

View all REI Co-op Women's Briefs

Technical Specs

Best Use

Multisport

Underwear Style

Bikini

Fabric

49% merino wool/30% TENCEL lyocell/15% nylon/6% LYCRA spandex

Moisture Wicking

Yes

Quick Drying

Yes

Gender

Women's

Sustainability

Fair Trade Certified™ Factory

From a Climate Label Certified brand

REI Co-opREI co-op logo

Better gear is built together

From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.

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        member informed certification and 100% satisfaction guarantee
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List of certifications which include The Climate Label certification,
        member informed certification and 100% satisfaction guarantee

Reviews
60 reviews with an average rating of 4.1 out of 5 stars

78% 35 of 45 reviewers recommended

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Average Overall Fit Rating

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Most Helpful Favorable Review

33 people found this review helpful
5 reviews with an average rating of 5.0 out of 5 stars
5 months ago
I love a merino granny panty
After checking out reviews, I was a little hesitant to purchase these, but I'm glad that I did. Ladies, these are a full coverage panty and there's nothing wrong with that! I did purchase these to wear around the house, under sweatpants, and during nights while camping, and they keep me warm, dry, and are super comfy. Yes, they have a high rise in the back but I wouldn't say they run "large," that is just the cut. Obviously you will wear thongs during the day if you're worried about panty lines. Get these if you want a high quality granny panty, wear high-waisted and looser-fit pants, and want to embrace your comfy, middle-aged identity.
TMN
Reno, NV

Most Helpful Critical Review

30 people found this review helpful
5 reviews with an average rating of 3.0 out of 5 stars
3 years ago
Wish these were seamless
Received free product
Pros: * Extremely comfortable * Full coverage * No movement, bunching or chafing during activities Cons: * Thick seams are very visible through pants * Waistband comes up higher than my pants Would love to see a seamless version of these. They were great for lounging at home, but too visible for wearing out in public.
mbf_in_mn
Minneapolis, MN
TMN
Location:Reno, NV
Age:35–44
Weight:125–150 lbs.
Height:5'6"
Rated 5.0 out of 5 stars
5 months ago

I love a merino granny panty

After checking out reviews, I was a little hesitant to purchase these, but I'm glad that I did. Ladies, these are a full coverage panty and there's nothing wrong with that! I did purchase these to wear around the house, under sweatpants, and during nights while camping, and they keep me warm, dry, and are super comfy. Yes, they have a high rise in the back but I wouldn't say they run "large," that is just the cut. Obviously you will wear thongs during the day if you're worried about panty lines. Get these if you want a high quality granny panty, wear high-waisted and looser-fit pants, and want to embrace your comfy, middle-aged identity.

Age:35–44
Weight:125–150 lbs.
Height:5'6"

Overall Fit Rating

Runs SmallRuns Large
Montana Fly Girl
Location:Montana
Age:55–64
Weight:125–150 lbs.
Height:5'4"
Rated 2.0 out of 5 stars
2 years ago

Product looks great, but is way too big!

I ordered a medium as I always purchase the REI Co-op Active Bikini Underwear in a medium and they fit great. (Unfortunately, they have been hard to find in my size lately.) I ordered these online and when I compared the size difference to my Co-op underwear, these were like granny-panties and were huge. I didn't even need to try them on. They are going back. Positive note: The material feels nice and soft and I like the elastic material on the waistband. I might try them in an extra small.

Age:55–64
Weight:125–150 lbs.
Height:5'4"

Overall Fit Rating

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Jagjas
Location:Tampa, FL
Age:45–54
Weight:125–150 lbs.
Height:5'8"
Rated 4.0 out of 5 stars
3 years ago

Almost Perfect

Received free product

I love the soft fabric of this bikini. I really like the colors. I got the sea forest. Fits true to size. I thought the coverage was too much for a bikini, more like a boy short. The bikini kept me feeling dry on a sunny hike. This bikini comes up too high for my liking and comfort. I'm not used to such a fit, and it didn't feel too good with the elastic at the mid-tummy. Due to that, I'm constantly aware that I am wearing it. It's definitely not the one I reach for - for hours of adventure. Less fabric, no-show seams, and a little shorter and you have your perfect bikini!

Age:45–54
Weight:125–150 lbs.
Height:5'8"

Overall Fit Rating

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pihiker
Location:Boise, ID
Age:55–64
Weight:125–150 lbs.
Height:5'4"
Rated 3.0 out of 5 stars
3 years ago

Great for active adventures

Received free product

The only issue I had with these underwear was the size was not close to what I am used to. I wear a solid size medium in just about anything sized by S, M, L, ... However, these were really big, especially in the back end. They fit fine around the waist and legs, but there was too much material in the back so they seemed to bag and get loose when I was sweating. They were otherwise comfortable, dryed quickly on the trail and there was no issues with odor at all. They fit more like a hipster than a bikini, but I liked the wide waistband and two tone design. If they were a better fit, they would be perfect.

Age:55–64
Weight:125–150 lbs.
Height:5'4"

Overall Fit Rating

Runs SmallRuns Large
mbf_in_mn
Location:Minneapolis, MN
Age:35–44
Weight:125–150 lbs.
Height:5'0"
Rated 3.0 out of 5 stars
3 years ago

Wish these were seamless

Received free product

Pros: * Extremely comfortable * Full coverage * No movement, bunching or chafing during activities Cons: * Thick seams are very visible through pants * Waistband comes up higher than my pants Would love to see a seamless version of these. They were great for lounging at home, but too visible for wearing out in public.

Age:35–44
Weight:125–150 lbs.
Height:5'0"

Overall Fit Rating

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MJB
Location:Portland Oregon
Age:35–44
Weight:225–250 lbs.
Height:5'7"
Rated 4.0 out of 5 stars
2 years ago

Finally we get some plus size merino undies!

Great undies, soft and stretchy. Seem well made, all seams look good. And I love merino - antimicrobial for the win! The only complaint I have is these give me wedgies. all. the. time. I think the butt cheeks need another inch or two of fabric to each side. I got a wide load coming though. That being said, I'll still wear them. I just have to be aware where I'm going that day, because I will be picking my seat.

Age:35–44
Weight:225–250 lbs.
Height:5'7"

Overall Fit Rating

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aandm200
Age:25–34
Weight:200–225 lbs.
Height:5'7"
Rated 5.0 out of 5 stars
2 years ago

Comfortable, Soft, Cute

I splurged and bought one pair of these because I was really curious about merino as an underwear fabric, and they're so great. if they weren't so expensive, I'd buy them for all of my daily wear. They're odor resistant, comfortable, and come in cute colors. I'm usually an XL or 2X and I bought a 3X and they fit great. You know underwear is great when you don't think about it at all, and that's this.

Age:25–34
Weight:200–225 lbs.
Height:5'7"

Overall Fit Rating

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Baxter
Rated 5.0 out of 5 stars
2 years ago

Great for Activities

I bought these just before my husband and I took a paddling trip to the Allagash Wilderness Waterway in Maine at the end of Sept. They dried fast and kept me warm when they got wet. Remained comfortable even after we went hiking for the day. I think the fit is perfect for activities and I really like the comfort of the waist band & the coverage, they felt secure and I did not have to keep making adjustments. So glad I had these for the trip, and when I used other underwear they did not dry as quickly as these. Washed and dried well in the backcountry. I really like them, I just ordered 2 more in 2 different colors.

Effie
Location:Finger Lakes
Age:55–64
Weight:100–125 lbs.
Height:5'4"
Rated 5.0 out of 5 stars
1 year ago

Inca Trail tested! Outstanding wicking undies

I find most synthetic “wicking” underwear to be nonwicking and generally uncomfortable. These wool blend undies are just fabulous. Super soft, stay in place, truly wicking, and not stinky after a day on the trail. They dry fast too so they are great for camping. I liked them so much that I bought the matching bras. Highly recommend! (The “bikini” looks huge and like a brief, but it’s the right shape to stay in place.)

Age:55–64
Weight:100–125 lbs.
Height:5'4"

Overall Fit Rating

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SH from NY
Rated 2.0 out of 5 stars
1 week ago

Need technical design team to address

These were comfortable and fit well in the front, but there is a design issue with the cut and design on the back bottom. The fabric near the elastic was too generous and the elastic in the area was also not tight enough, so you end up with the panties not snug against the skin but rather with a fairly large gap right at that area. I think it's a design issue. Need to have their technical design team work on this some more, and I hope they do because other than that, these are nice. Wish I could return and order again if/when they fix.

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1 - 10 of 60 Reviews

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