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  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear size XL
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
  • Load image into Gallery viewer, Essential Bikini
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear size XL
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Natural & Sustainable Seamless Merino Bralette + Bikini Underwear
Essential Bikini

Essential Bikini

$34.00
$34.00
$34.00

Our Essential Bikini is designed to stay put, move with you, and keep you swamp-ass free and funk-free throughout your entire day no matter your adventure.  Our seamless design and comfort waistband eliminate digging and rolling during your hike, ride, climb, workout, or vinyasa.  It’s so comfortable, you’ll forget you’re even wearing it!  

Insider Tip: One of the reasons women love our Bikini is because it’s great in and around water.  It dries in the blink of an eye!

Size What's my size?

SIZE CHART

Seamless knitwear is super stretchy, so you might fit a couple of sizes depending on how you much compression you want.  We recommend going with your standard as-usual size but upsize if you are not sure.

  XS S M L XL
Pant (US) 00-2 2-4 6-8 10-12 12-16
Waist (US) 23-24 24-26 26-28 28-30 30-32
Hips (US) 32-34 34-36 36-38 38-40 40-42

Tell me more about the fit

Our innerwear is meant to fit snug on the body, if you prefer a looser fit, then we recommend sizing up.  If it feels just a little tight and you aren't sure if the next size up would be better, then we recommend wearing/washing it 3-5 times to see if it breaks in to your liking before exchanging it for another size.

Will it stretch out?

Not really.  Our innerwear does give with wear, but only to mold to your body.

What sizes are the models wearing?

Natalia is wearing a Medium Black Bikini, Galen is wearing a Medium Light Nude Bikini, Riley is wearing an X-Large Light Nude Bikini, Emma is wearing a Small Warm Nude Bikini, and Bri is wearing a Medium Dark Nude Bikini.

BUNDLE AND SAVE! 

Whether you’re new to BRANWYN or have already replaced all your undies with our Performance Innerwear, we've got you covered with a sweet bundle discount. 

Buy 3 or more of the exact same style/size/color and you’ll receive

10% OFF ANY 3+ ITEMS

Discount applies automatically at checkout!  Discount is not combinable with other promotions including the $10 off Welcome Coupon.

Color Bundle
Black
Light Nude
Warm Nude
Dark Nude
Luna Gray

SIZE CHART

Seamless knitwear is super stretchy, so you might fit a couple of sizes depending on how you much compression you want.  We recommend going with your standard as-usual size but upsize if you are not sure.

  XS S M L XL
Pant (US) 00-2 2-4 6-8 10-12 12-16
Waist (US) 23-24 24-26 26-28 28-30 30-32
Hips (US) 32-34 34-36 36-38 38-40 40-42

Tell me more about the fit

Our innerwear is meant to fit snug on the body, if you prefer a looser fit, then we recommend sizing up.  If it feels just a little tight and you aren't sure if the next size up would be better, then we recommend wearing/washing it 3-5 times to see if it breaks in to your liking before exchanging it for another size.

Will it stretch out?

Not really.  Our innerwear does give with wear, but only to mold to your body.

What sizes are the models wearing?

Natalia is wearing a Medium Black Bikini, Galen is wearing a Medium Light Nude Bikini, Riley is wearing an X-Large Light Nude Bikini, Emma is wearing a Small Warm Nude Bikini, and Bri is wearing a Medium Dark Nude Bikini.

BUNDLE AND SAVE! 

Whether you’re new to BRANWYN or have already replaced all your undies with our Performance Innerwear, we've got you covered with a sweet bundle discount. 

Buy 3 or more of the exact same style/size/color and you’ll receive

10% OFF ANY 3+ ITEMS

Discount applies automatically at checkout!  Discount is not combinable with other promotions including the $10 off Welcome Coupon.

Free Shipping on orders $50+
If an item is out of stock, select your preferred size and color and click "Notify Me When Available" to add your name to the waitlist!

Our Essential Bikini is designed to stay put, move with you, and keep you swamp-ass free and funk-free throughout your entire day no matter your adventure.  Our seamless design and comfort waistband eliminate digging and rolling during your hike, ride, climb, workout, or vinyasa.  It’s so comfortable, you’ll forget you’re even wearing it!  

Insider Tip: One of the reasons women love our Bikini is because it’s great in and around water.  It dries in the blink of an eye!

Our Essential Bikini features a low-rise and four-way knit stretch that fits snug around your hips.  Constructed using seamless knitting technology so the seams lie flat against your body without chafing.  

Performance Innerwear is designed to hug your body.  If you prefer a less compressed fit, or are in-between sizes, we recommend sizing up.  See size guide for more information.

Machine wash cold with like colors and mild eco-friendly detergent. Do not use bleach or fabric softener.  Always wash black and dark colors separately. No washing machine? Simply hand wash with a mild soap or shampoo in the sink, or in the shower, and hang to dry. Do not dry clean.
 
A GLDNspun knit blend of 81% extra fine Merino wool, 12% nylon, 7% spandex.

Our Merino wool is sourced from sheep raised in Australia.  Our yarn is engineered and spun by Sudwolle Group in Europe. Our factory is located in Istanbul, Turkey.  

Each individual piece is knit seamlessly on Santoni machines as a panel in its natural un-dyed color.  Then, the panels are garment dyed in small batches.  Next, each panel is hand-cut to its final shape.  Finally, the cut pieces are sewn, and hand finished as needed.  Each garment is unique, so no two garments are exactly alike. We are very proud of our craft, slow manufacturing process.
 

PERFORMANCE WITHOUT COMPROMISE

Give your bits the gift of super soft, ultra fine Merino wool that will leave you boob-sweat free, funk-free and swamp-ass free and feeling cool, comfy and dry. Good for you and the planet!

Female Friendly

moisture wicking

Naturally Breathable

Temperature RegulatiNG

Odor NEUTRALIZING

Super Soft Material

COMFORT WAISTBAND

no digging, rolling, chaffing or pinching

MOVES WITH YOU

super-soft Merino that moves with you without bunching

FUNK-FREE

naturally moisture-wicking to keep you fresh and dry all day

1. COMFORT WAISTBAND

no digging, rolling, chaffing or pinching

2. MOVES WITH YOU

super-soft Merino that moves with you without bunching

3. FUNK-FREE

naturally moisture-wicking to keep you fresh and dry all day

Customer Reviews

Based on 129 reviews
90%
(116)
7%
(9)
2%
(2)
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K
Karen A. (Anacortes, US)
Best briefs EVER

Love love love these, and slowly phasing out all my other undies. So comfortable, so stretchy - and such easy care! Cold water wash & hang to dry - they’re dry in a jiffy!

M
Melissa R (Asheville, US)
Best Undies for Every Day and Working Out (even for those of us who can't wear wool!)

I normally can’t wear any merino wool against my skin, but BRANWYN’s bikinis are super soft and don’t itch my skin when I wear them! I can’t believe how amazing these underwear are for wearing all day at work and working out in too! They stay dry and don’t get super stinky, which is awesome when you’ve forgotten to do laundry and don’t have any clean undies to wear and need to snag a pair from the laundry pile.

R
R.
On the Appalachian Trail

I previously owned two pairs of Branwyns, and they came along with me hiking in so many different places--from backpacking in the Redwoods, snowstorms in Utah, 115 degree heat in the Badlands, to 99% humidity in Florida and beyond. They were all I would consider for anything active or sweaty. I have tried literally every other brand of Merino/natural fiber/active underwear, and nothing compares to Branwyn. My pairs didn't make it back from the laundromat just prior to starting my Appalachian Trail thru hike. 211 miles in, and I'm checking every week for the restock. As soon as they're restocked I will pay to ship them wherever I am along the trail, and immediately discard the Icebreaker and Boody pairs I ended up bringing along. Seriously, try them--amazing customer service as well.

123

FIRST PAIR GUARANTEE

LOVE BRANWYN OR IT'S FREE!

We know how challenging it can be to find a decent piece of underwear.

Our First Pair Guarantee allows you to try 1 pair of each unique style/size/color on your first order, and return risk-free within 14 days of receiving your order.

Please be sure to keep any duplicate pairs you ordered unopened and unworn in case you need to swap out!

LEARN MORE
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