Side view of BRANWYN Essential Bikini Merino underwear in warm nude. Soft, breathable, and odor resistant, sustainable underwear.
Warm nude Merino wool panties in a bikini cut by BRANWYN. Made from natural fiber Merino wool to provide a sustainable solution for eco-conscious women.
Back view of bikini style Merino wool underwear for women in warm nude. BRANWYN's Essential Bikini is made of super soft, knit, seamless Merino wool for ultimate comfort.
Woman wearing the BRANWYN Essential Bikini, Merino wool underwear for women in Warm Nude. Moisture-wicking natural fiber underwear for hiking, yoga, travel, and everyday wear.
Close-up of woman with arms crossed wearing the Warm Nude BRANWYN Essential Bikini, Merino wool underwear for women. Moisture-wicking natural fiber underwear with temperature-regulating Merino wool.
Woman smiling in the Warm Nude BRANWYN Merino wool bra and Essential Bikini, Merino wool underwear for women made from breathable natural fibers.
Back view of the Light Nude BRANWYN Essential Bikini and matching Merino wool bra, seamless Merino wool underwear for women made from natural fibers.
Woman with gray hair smiling in the BRANWYN Essential Bralette and Essential Bikini, seamless Merino wool underwear for women made from breathable natural fibers.
Side profile of BRANWYN Essential Merino wool Bikini underwear in Luna Grey. Gynecologist recommended underwear made of natural fibers.
BRANWYN Grey Merino Wool Bikini Underwear—seamless, soft, sustainable, and twice as durable as synthetic underwear.
Back view of BRANWYN Essential Bikini Underwear made of sustainable Merino. Naturally toxin and forever chemical free women's underwear.
Women stretching grey Merino underwear. Sweat wicking, breathable, Merino underwear that moves with you and supports you for active women.
Back view detail of bikini underwear waistband in Luna grey Merino Wool. BRANWYN's Essential Bikini is completely seamless making it comfortable and chafe free.
Woman doing yoga in grey BRANWYN Merino bra and underwear set. Breathable Essential Bikini underwear is quick drying and keeps you fresh for workouts.
Close up of soft, comfy, seamless Merino underwear in the bikini style by BRANWYN in black.
Side view of the black BRANWYN Essential Bikini, seamless Merino wool underwear for women made from breathable natural fibers
Woman stretching in black Merino wool underwear set. The seamless design makes these a comfortable, stretchy, wedgie free underwear.
Close up of BRANWYN's black Essential Bikini underwear. Gynecologist approved Merino wool underwear made of natural, sustainable knit fabric.
Back view of the comfiest Merino bikini style underwear in black with full coverage bikini style, seamless design and breathable Merino wool.
Side view of the black BRANWYN Essential Bikini, Merino wool travel underwear for women made from breathable natural fibers.
Woman sitting and stretching in black BRANWYN Merino underwear set. Active underwear perfect for yoga, stretching, pilates, and workouts.
Front view of dark nude Essential Bikini underwear, full coverage Merino wool panties for everyday wear.
Back view of the best travel underwear. BRANWYN's Essential bikini in dark nude is perfect for on the go with odor reducing and mositure wicking Merino wool.
Dark nude brown BRANWYN Merino wool bra and panties set on woman standing, sustainable toxin-free underwear made of regenerative materials.
Woman wearing dark nude brown BRANWYN Essential Bikni underwear and matching bra, showing seamless design.
Back view of woman with curly hair smiling in BRANWYN seamless Merino wool bra and underwear set in dark nude brown
Woman posing in dark nude brown Merino underwear set, wearing BRANWYN Essential Bikini underwear made from soft, moisture wicking natural fibers.
Woman in BRANWYN Essential Bikini underwear set, side view, made of breathable Merino wool for active women and outdoor adventures.
Athletic woman wearing the BRANWYN Essential Bikini underwear in light nude. Merino wool underwear designed for activity with breathable knit and sweat wicking wool fabric.
Close up of BRANWYN Essential Bikini underwear in light nude. These Merino panties stay dry with breathable, mositure wicking Merino.
Stretching woman wearing BRANWYN Merino wool underwear designed to wick sweat, stay dry, and remain breathable.
Woman stretching in Merino wool athletic underwear by BRANWYN, sweat wicking and temperature regulating comfort no matter the movement.
Woman in three legged dog yoga pose in matching light nude BRANWYN Merino Wool underwear set.
Front view of woman in BRANWYN Essential Bikini underwear in light nude Merino wool, sustainable and breathable for active women.
Back view of BRANWYN Essential Bikini underwear in light nude, seamless Merino wool bra and panties designed for comfort and performance.
Side view of woman wearing BRANWYN Essential Bikini underwear and matching bra in light nude Merino wool. Seamless underwear that is naturally soft and moisture-wicking.
Woman posing with arms raised overhead in BRANWYN women’s seamless Merino wool bikini underwear set in light nude.
Front view of BRANWYN Essential Bikini Merino Wool underwear in Future Dusk purple. Showing seamless full coverage panties with stretchy waistband.
Front view of BRANWYN Essential Bikini underwear in Future Dusk purple. Sweat wicking underwear made of breathable Merino wool, to keep you feeling fresh.
Back view of the BRANWYN Essential Bikini in Future Dusk, seamless Merino wool underwear for women with full coverage.
Woman posing in Merino underwear set, wearing BRANWYN Essential Bikini underwear in Future Dusk purple. Eco-conscious underwear made of regenative natural fibers.
Close-up detail of BRANWYN Essential Bikini underwear in Future Dusk purple Merino wool, seamless and breathable underwear made of natural fibers
Front view of model wearing the BRANWYN Essential Bikini in Transformative Teal, seamless Merino wool underwear for women made from breathable natural fibers.
Side view of a model wearing BRANWYN Sustainable Seamless Merino Wool Essential Bikini in Transformative Teal.
Back view of a model wearing BRANWYN Sustainable Seamless Merino Wool Essential Bikini in Transformative Teal.

Essential Bikini

$38.00 USD
1097 reviews
1097 reviews
Merino wool benefits listed with icons: [Sheep icon] Merino wool = Sweat free freshness [Knit icon] Seamless knit = Second skin comfort [Sustainability icon] ZQ Merino = Ethical and sustainable fiber
BRANWYN Merino wool Essential Bikini Underwear size guide slider.
Color:Black
Size:XS
Quantity:
In stock

Underwear Size Guide

All our knitwear has a lot of stretch, so you might be able to wear two different sizes. If you are unsure, size up.

WAIST HIPS PANT
XS 23 - 24 32 - 34 0 - 2
S 24 - 26 34 - 36 2 - 4
M 26 - 28 36 - 38 6 - 8
L 28 - 30 38 - 40 10 - 12
XL 30 - 32 40 - 42 12 - 16
XXL 32 - 34 42 - 44 16 - 18

Tell me more about the fit

Our Performance Innerwear is meant to fit snugly on the body. If you prefer a looser fit, 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 and washing a few times to see if it breaks in to your liking before exchanging it for another size.

Will it stretch out?

Not really. Our Performance Innerwear does give a bit with wear, but instead of becoming loose, it will mold to your body more over time.

Underwear Size Guide

All our knitwear has a lot of stretch, so you might be able to wear two different sizes. If you are unsure, size up.

WAIST HIPS PANT
XS 23 - 24 32 - 34 0 - 2
S 24 - 26 34 - 36 2 - 4
M 26 - 28 36 - 38 6 - 8
L 28 - 30 38 - 40 10 - 12
XL 30 - 32 40 - 42 12 - 16
XXL 32 - 34 42 - 44 16 - 18

Tell me more about the fit

Our Performance Innerwear is meant to fit snugly on the body. If you prefer a looser fit, 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 and washing a few times to see if it breaks in to your liking before exchanging it for another size.

Will it stretch out?

Not really. Our Performance Innerwear does give a bit with wear, but instead of becoming loose, it will mold to your body more over time.

Our Essential Bikini is designed to stay put and move with you, while keeping you funk-free, dry, and comfortable throughout your entire day no matter your adventure. Crafted from super-fine ZQRX Merino wool, our seamless design and comfort waistband eliminate digging and rolling during your hike, ride, climb, workout, or vinyasa — so comfortable, you’ll forget you’re even wearing it!

Bonus: Our ZQ+ and Responsible Wool Standard-certified Merino wool is also regenerative and sustainable. (which also means it is free of BPA, PFAs, and toxic forever chemicals).

Double Bonus: Our Bikini is great in and around the water. It dries in the blink of an eye.

For more, scroll down to check out our customers’ reviews!

COMPLETE THE SET

BRANWYN's seamless Merino wool Bralette bra in Black. Natural fiber, plastic free activewear. Close up of woman wearing black Merino bralette and raising arms over her head.
Essential Bralette
$52.00 USD
Front view of black Essential Racerback Sports Bra by BRANWYN. Merino Wool compressive bra wicks sweat and keeps you dry through hikes, skis and workouts. Close-up detail of racerback design on BRANWYN Racerback Sports Bra in black. Seamless Merino wool provides compressive, breathable support.
Essential Racerback Sports Bra
$85.00 USD

PERFORMANCE WITHOUT COMPROMISE

Designed for superior performance and maximum comfort—it all starts with Merino wool. Super-soft, ultra-fine Merino wicks sweat to keep you dry, fresh, and funk-free. The natural crimp of its fiber traps air so you stay cool when things heat up and keep warm when there’s a chill.

Moisture wicking

Naturally breathable

Temperature regulating

Benefits of Merino wool icon: Odor-resistant quality of seamless Merino wool

Odor Resistant

BUTTERY SOFT NATURAL FIBER

GYNECOLOGIST APPROVED