Side view of BRANWYN seamless thong underwear in light nude. Eco-friendly underwear made for travel, activity and everyday.
Back view of BRANWYN Essential Thong in light nude. Seamless Merino wool thong underwear for women.
Side view of BRANWYN Essential Thong underwear in light nude. Merino Wool seamless thong with temperature regulation and odor reduction makes it the perfect travel thong.
Woman wearing a light nude BRANWYN Essential Thong, seamless Merino wool underwear for women and moisture-wicking natural fiber underwear.
Woman mid air jumping in BRANWYN Essential Merino thong underwear in light nude. Gynecologist reccommended underwear made of Merino wool natural fibers.
Side view of BRANWYN's Merino wool thong in dark nude brown. The most comfortable thong for outdoor adventure and everyday.
Front view of BRANWYN Essential Thong, a sweat wicking Merino thong made to keep you dry and comfortable.
Model posing in Merino bra and thong set in dark nude brown wearing BRANWYN Essential Thong, a full coverage sustainable thong made of Merino wool.
Woman wearing BRANWYN Merino Thong in black. Seamless, sustainable underwear with breathable comfort.
Side view of BRANWYN Essential Thong in black. Seamless full coverage thong made of Merino wool.
Side view of BRANWYN Essential Thong in black. Sweat wicking Merino perfect for exercise, hiking, and active women.
Woman wearing BRANWYN Essential Thong in warm nude. Eco-friendly thong, nontoxic BPA and PFA free natural Merino fibers.
Back view of woman in Merino bralette and thong underwear set in warm nude by BRANWYN. Best thong for hiking and outdoor adventure.
Detail of BRANWYN seamless thong in warm nude with equal sign logo. Super soft Merino wool underwear that stretches and moves with you.
Side view of seamless thong in grey and matching bralette. Merino wool full coverage thong underwear.
BRANWYN Essential Thong in grey shown with bralette. Seamless, eco-friendly Merino wool thong underwear for women.
Grey full coverage thong by BRANWYN made from soft, moisture-wicking Merino wool.
Side view of woman sitting in Merino wool thong. Soft and comfortable stretchy thong
Product detail shot of BRANWYN Merino Wool thong in Future Dusk purple, highlighting soft, breathable, and sustainable fabric.
Woman standing in BRANWYN Merino Wool thong and bralette set in Future Dusk purple, seamless and sustainable performance underwear

Essential Thong

$36.00 USD
385 reviews
385 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 Thong Underwear size guide slider.
Color:Black
Size:S
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 Thong has a "forget it's even on" level of comfort and a low profile. Crafted with the finest Merino wool, it will keep you funk-free, fresh, and dry all day long. Our seamless design and comfort waistband eliminate digging and rolling during your hike, ride, climb, workout, or vinyasa. It’s the perfect “barely there” solution for your toughest workouts and longest adventures!

Bonus: Our ZQ+™, Woolmark™, and RWS-certified GLDNspun™ seamless Merino wool is also regenerative and sustainable. (which also means it is BPA-free, PFAs-free, and toxic-free).

Double Bonus: Virtually invisible under leggings and base layers, our Essential Thong feels like a second skin and stays put as you bend, squat, and stretch.

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