Side view of BRANWYN seamless Essential 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 thong with temperature regulation and odor reduction makes it the perfect travel thong.
Woman wearing BRANWYN Essential Thong in light nude. Made from soft, moisture-wicking Merino wool, this thong is naturally toxin free.
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 BRANWYN Essential 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

Sale price$36.00 USD

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 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 eliminates 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, OEKO-TEX, and Responsible Wool Standard certified GLDNspun™ Merino is also regenerative and sustainable. (which also means it is free of BPA, PFAs, and toxic forever chemicals).

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!

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

Odor Resistant

BUTTERY SOFT NATURAL FIBER

GYNECOLOGIST APPROVED

Customer Reviews

Based on 336 reviews
80%
(270)
13%
(45)
4%
(12)
2%
(8)
0%
(1)
E
Eve
Go to for work underwear

As a nurse, things get hot and sweaty. These are my go to for every working shift knowing that I’ll stay fresh and dry and feel clean.

S
SH (Cartersville, US)
Comfortable and moisture wicking

Tested these on a couple of long hikes , very comfortable,hung it to dry afterwards just to test the smell first when I put in my backpack . It was perfectly fine!

s
sarah s. (Eugene, US)
The only ones I want to wear!

I am 5’6” 120 lbs and order a size L in these amazing thongs. M would also work, but I like the fit of the L since it digs into my hips less. I have a while weeks worth of these to wear on repeat! Thank you Branwyn. ❤️

J
Janet Boss (Burnsville, US)
Essential Thong thoughts

I really wanted to love these as much as I love the bralettes. While it’s close, I’m guessing I’m between a Sm and a Med. I ordered small because I always do. These are just a tiny bit smaller than I expected. My biggest critique is the binding edges on the leg openings. I wish it were a flatter fit. Other than that, I’m still a fan! I I’ll likely try a Med next time.

a
anuh (Sarasota, US)
yes

like the other reviews mention, there is alot more fabric in the front than the normal thong, but its not super bothersome (not thick and bunchy-- but very thin, light and breatheable), more like a hipster fit in the front. I tried both the XS and the S. I have 23" waist and weigh 100 lbs. The XS actually fit perfect. But the S was more comfortable, didn't cut into my legs, give a wedgie or leave lines. OMG this thong is like air. I've been wearing in Florida heat for 5 days now. Every night I hand wash it and by morning it's dry. NO smell. NO wet strap between your legs or up your butt. YES. Got in every color.

MONEY BACK GUARANTEE FOR 14 DAYS

Not sure about wool?

Merino is super soft like cashmere!

We know you'll love it! But just in case you don't, we’ll give you a full refund.