Women's Alpaca Wool Thong

160 Ultralight

$40.00
3.3Rated 3.3 out of 5 14 reviews

Choose less coverage from your first layer. This women's thong uses 160 g/m² Alpaca wool fabric in a minimal rear cut for everyday wear and travel.

This size is currently out of stock. Get notified when it's back.

Low Impact Dyes

Natural Dyes

Natural Blue
Why natural?
Size: XSSize guide

This size is currently out of stock. Get notified when it's back.

Free US shipping on orders over $200.

Final sale for hygiene reasons. This intimate apparel can't be returned or refunded. Defective-item claims are handled separately under our warranty.

A light first layer with less coverage.

Your layer starts with Alpaca wool from Peru. Its smooth fiber surface gives the knit a soft feel, while the knit structure allows air to move through as you do.

Product info

  • Choose the coverage you prefer

    The thong cut leaves less fabric at the back than our panties, with the same 160 g/m² Alpaca knit.

  • Breathable on the move

    The light knit lets air move through, giving you a comfortable layer as you go from everyday miles to a change of pace.

Perfect for

  • Everyday wear
  • Travel
  • Designed as next-to-skin underwear.

Product details

What goes into your layer
  • Fabric100% Alpaca wool
  • Thread100% cotton
  • Labels100% organic cotton
  • DyesNatural or OEKO-TEX certified, depending on the color.
  • Label inkGOTS certified

Specifications

  • Fabric weight160 g/m²
  • Weight24 g / 0.8 oz in size S
  • ConstructionThong with minimal rear coverage
  • FitFitted cut with natural stretch
  • Made inPeru
Size & fit

Use your body measurements to choose your size. These are body ranges, not flat garment measurements.

SizeWaistHips
XS23 - 26 in31.5 - 34 in
S26 - 29 in34 - 37 in
M29 - 31.5 in37 - 40 in
L31.5 - 34 in40 - 42.5 in
XL34 - 37 in42.5 - 45 in
XXL37 - 40 in45 - 48 in
SizeWaistHips
XS59 - 66 cm80 - 87 cm
S66 - 73 cm87 - 94 cm
M73 - 80 cm94 - 101 cm
L80 - 87 cm101 - 108 cm
XL87 - 94 cm108 - 115 cm
XXL94 - 101 cm115 - 122 cm
Care for your layer

Hand wash or machine wash on a gentle/wool cycle in cold water (50-68°F). Use a mild wool-safe or pH-neutral detergent. Wash with similar colors. Don't bleach or use fabric softener.

Reshape while damp and lay flat to dry. Don't tumble dry, twist, or wring. Cool iron if needed. Store folded in a cool, dry space with airflow; avoid hanging.

Naturally dyed colors can transfer with sweat or friction. Wear them with dark clothing or equipment, wash sparingly, and avoid citric acid, which can lighten the color.

Shipping & Returns

US orders over $200 ship free. Estimated US delivery is 7 to 10 business days, including preparation and transit. You'll receive a tracking number by email once your order ships. International rates are calculated at checkout; estimated delivery is 10 to 20 business days. Customs duties and import taxes are your responsibility.

For hygienic reasons, all underwear and intimate apparel (including boxers, panties, thongs, and bras) is final sale and cannot be returned or refunded.

Women's Alpaca Wool Thong: 160 Ultralight

The benefits

Why Alpaca wins

Alpacas en los Andes peruanos

Andes-adapted for changing temperatures

Alpacas evolved where days run warm and nights turn cold. Their semi-hollow fibers trap insulating air, helping you stay comfortable as the temperature changes.

Softness starts in the fiber

Alpaca’s smoother scales give the fabric a soft feel against your skin. Comfort comes from the fiber’s structure.

Comfort starts next to your skin

Alpaca wool brings breathable comfort to your first layer. Wash intimate apparel after wear to keep it clean; natural odor resistance doesn't replace regular care.

Single origin

Peru, start to finish.

Arms of Andes is a family company with roots in the Peruvian Andes. “Arms” brings together the initials of four siblings. That connection to Peru shapes what we make and where we make it.

From fiber sourcing and yarn spinning to knitting and sewing, production stays in Peru. One country, with the people and knowledge behind your gear close together.

Learn our story

Customer reviews

  • 5 stars: 7 (50%)
  • 4 stars: 0 (0%)
  • 3 stars: 2 (14%)
  • 2 stars: 0 (0%)
  • 1 star: 5 (36%)
J
Jessica
Incorrect picture listed on website for Wool Thong

I am disappointed in Arms of Andes' response false advertising and their response.
I ordered the wool thong last year. It was a very lovely cut and have been planning to order more.
I received my recent (second) order in Feb of 2026 of the same wool thong I purchased previously.
As soon as I opened the packaging for the thongs, I saw the design had changed.
There is much more fabric, the lovely cut is no longer part of the design with the added fabric.
I ordered the same size and style as before.

Arms of Andes has refused to give a refund.
The images on their website do not reflect the updated design of their wool thong.
As a return customer, ordering the exact same item, but receiving a different style (and this update is not noted on their website), this is terrible customer service.

Hi Jessica! Thank you for sharing your feedback. We’re sorry the updated design wasn’t what you expected. The order was refunded, and the matter has been taken care of.

K
Kailey
Second best thongs I’ve tried

On my quest to find all the best natural fiber panties and these are my second favorite ones. Only because the front dips a tiny bit lower than I’d like but overall I love these so much. They don’t feel as thin and flimsy as ones I’ve tried from a Marino wool store. Would recommend but definitely they do dip low in the front and could use half an inch in the gusset.

E
Elinor
Too thin but at least they are not itchy

I had high hopes for these undies. They are very soft, it feels a bit like you are not wearing anything at all when you first put them on. Alas, these are shaped a bit oddly. The gusset isn't large enough & does not sit in the right place. They are particularly uncomfortable if you sweat as they then get very sweaty & stay that way in the groin area....partly because the gusset's not large enough & seems placed awkwardly. All that said, while I would not buy these again, I might try a different style because at least these are more eco-friendly than a lot of undies as they don't have all the elastic & synthetics that a lot of the companies that make wool undies do. There was zero itch on the undies which is interesting as their leggings actually do itch, albeit only a little bit.

Hi Elinor! Thanks for sharing your honest feedback. We’re glad to hear the fabric felt soft and non-itchy, but we’re sorry the fit and gusset design weren’t comfortable for you. We appreciate you giving them a try and will share your comments with our team as we continue improving our styles.

J
Julie
Not worth it

Seemed at first like a good purchase, but the return process is a scam. These contain elastic and synthetic materials in the waistband and stretch out quickly with wear and fit is poor. Regret purchasing from this website.

Hi Julie! We appreciate your feedback, though we’d like to clarify that your statement is incorrect. Our garments do not contain any synthetic materials. As clearly stated in the product description, the waistband is made from a natural tree rubber and cotton elastic blend, not synthetic fibers. We understand fit preferences can vary, but we take pride in providing fully natural, toxin-free garments, and all material details are transparently listed on our website.

E
Emil
Great product and fit was perfect

Great product and fit was perfect

S
Sheila
These are great. I'm in between sizes and...

These are great. I'm in between sizes and opted for the one up and it fit beautifully. Just got back from a hiking trip and these guys kept me fresh despite the humidity and sweating!

A
Alexane
Bummed to find out they lied about what is...

Bummed to find out they lied about what is was made of

A
Alexane
They lied about its composition/materials,...

They lied about its composition/materials, super disappointed

A
Alexane
Lied about its lack of elastic/toxicity

Lied about its lack of elastic/toxicity

E
Emily P.
Great for running; size up

Very comfortable and breathable for running! I machine wash cold, hang dry and have had no issues after a couple washes.
When I buy again, I’ll go up a size. I’m pear shaped and went by my waist size based on the size chart. I should have gone with my hip size which is a size larger on the size chart.

Hi Emily,
Thank you so much for sharing your experience! We’re glad to hear the leggings have been comfortable and breathable for running, and that they’ve held up well after washing. Your sizing tip is really helpful for others, thank you for pointing out how going by hip size can make a difference for pear-shaped figures. We’re glad you’re already planning your next pair!

J
Juana
I like these, but they seem to run small....

I like these, but they seem to run small. Order up.

L
Lindsey Duke
Love them!

These were so comfortable!

Hi Lindsey,
We're so happy to hear that you loved them!. Comfort is what we aim for, so it’s great to know they hit the mark.
Thanks for your support!

E
Emily
Size up!

Well made, but really tight. I’m usually an extra small, and I measured myself and ordered the small. It’s still really tight and riiides up. Unfortunately, I can’t wear it comfortably. I wish I had ordered a medium.

Hi Emily,

We’re so glad you love the quality, but we’re really sorry the size didn’t work out for you. That’s super helpful for us to know, and we truly appreciate you sharing your experience. If you ever need any help with sizing or anything else, don’t hesitate to reach out—we’re always happy to help!

Hope to get it right for you next time!

C
Carmen
I was on a quest to try all the alpaca or...

I was on a quest to try all the alpaca or merino wool underwear. Hands down the best quality, honesty, and best customer service comes from A o A! Alpaca > merino wool.