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Women's Merino Underwear Pack Builder
Women's Merino Underwear Pack Builder
The most comfortable travel underwear for any journey. Made from lightweight, superfine Merino wool, it’s breathable, ultra-stretchy, and luxuriously soft against your skin. With our Pack Builder, the more you pack, the more you save.
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Free delivery on all UK orders
The most comfortable travel underwear for any journey. Made from lightweight, superfine Merino wool, it’s breathable, ultra-stretchy, and luxuriously soft against your skin. With our Pack Builder, the more you pack, the more you save.
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The most comfortable travel underwear for any journey. Made from lightweight, superfine Merino wool, it’s breathable, ultra-stretchy, and luxuriously soft against your skin. With our Pack Builder, the more you pack, the more you save.
United Kingdom |
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Standard Delivery 2 to 3 weeks - FREE
Please note that international customers (outside of Canada and the United States) may be subject to taxes or duties upon delivery.
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International |
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USAFree Standard Delivery (2 to 6 business days)
CanadaStandard Delivery- 5 to 7 business days - FREE
Europe Zone 1Germany, Belgium, Croatia, Denmark, Estonia, Finland, France, Hungary, Ireland, Latvia, Luxembourg, Netherlands, Spain, Sweden, Switzerland, Poland, Portugal, Bulgaria, Greece, Italy, Malta, Austria, Cyprus
Europe Zone 2Iceland, Lithuania, Norway, Romania, Slovakia, Slovenia, Czechia, Gibraltar Standard Delivery ($200 and up) 2 to 3 weeks - FREE
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Australia, New ZealandStandard Delivery ($200 and up) 2 to 4 weeks - FREE
Japan, Hong Kong SAR, South KoreaStandard Delivery ($250 and up) 2 to 4 weeks - FREE
Malaysia, SingaporeStandard Delivery ($250 and up) 2 to 4 weeks - FREE
Rest of worldStandard Delivery 2 to 4 weeks - $19.99 |
RETURNS & EXCHANGES
We make it easy for you to try — and fall in love with — Unbound Merino.
You can return or exchange clothing purchased directly from unboundmerino.co.uk as long as it is unworn, unwashed, and in the original condition in which it was delivered. UK and international customers are responsible for return shipping costs, but a full refund will still be issued once the item is received and approved. We are happy to offer a full refund or exchange for any reason within 90 days from the delivery date.
Please note that exchanges are subject to availability, and a refund will be processed if the product you requested is unavailable. All socks and underwear purchases are final sale and cannot be returned or exchanged for sanitary reasons. Final Sale items can't be returned or exchanged. Delivery costs on the original order (including duties and taxes) are not refundable. Refunds are issued to the original payment method on the order, which may include gift cards if one was used.
Visit returns.unboundmerino.com to begin your return or exchange.
Once you start a return or exchange, please note you have 28 days to deliver the item back to us before the request expires. For orders delivered to the UK, we are unable to provide prepaid return labels at this time.
If you have any further questions, please contact us at help@unboundmerino.com
As featured in
What's included
Women's Merino Bikini
- 60% Merino Wool, 34% Nylon, 6% Spandex
- 290 gsm
- Seamless Knit Fabric for all day comfort.
- Lightweight
- Fast drying

Women's Merino Thong
- 60% Merino Wool, 34% Nylon, 6% Spandex
- 290 gsm
- Seamless Knit Fabric for all day comfort.
- Lightweight
- Fast drying

Merino wool is nature’s miracle
Doesn't Smell
Stays fresh and odor free for weeks.
Regulates your temperature
Breathable and insulating.
Dries fast
You’ll be dry and comfortable quickly.
Doesn’t wrinkle
It’s good to go whenever you need it.
MORE BUNDLE OPTIONS







3 Pack // T‑Shirts
Bundle and save. Choose 3 T-shirts in a variety of colors and styles.





5 Pack // T‑Shirts
Bundle and save. Choose 5 T-shirts in a variety of colors and styles.










Hoodie + T‑Shirt Bundle
Choose 1 Hoodie and 1 T-shirt. Available in a variety of colors.










Travel Trousers + T‑Shirt Bundle
Choose 1 Travel Trousers and 1 T-shirt. Available in a variety of colors.






2 Pack // Travel Shorts
Choose any 2 pairs of Shorts from 4 color options.










2 Pack // Merino Travel Trousers
Choose any 2 pairs of Travel Trousers. Available in a variety of colors.






2 Pack // Compact Travel Hoodie
Choose any 2 Travel Hoodies from 8 color options.






1 Pack Bundle
Choose 1 T-shirt, 1 pair of underwear and 1 pair of socks. Available in a variety of colors.






2 Pack Bundle
Choose 2 T-shirts, 2 pairs of underwear and 2 pairs of socks. Available in a variety of colors.








3 Pack Bundle
Choose 3 T-shirts, 3 pairs of underwear and 3 pairs of socks. Available in a variety of colors.








2 Pack // Button‑Up
Choose any 2 Button-Ups from 6 color options.







2 Pack // Long Sleeves
Choose any 2 Long Sleeves from 8 color options.






2 Pack // Polos
Choose any 2 Polos from 8 color options.






2 Pack // Boxer Briefs
Choose any 2 pairs of underwear from 10 color options.




2 Pack // Ankle Socks
Choose any 2 pairs of Socks from 2 color options.




3 Pack // Merino All Season Ankle Socks
Choose any 3 pairs of Socks from 2 color options.




5 Pack // Merino All Season Ankle Socks
Choose any 5 pairs of Socks from 2 color options.




10 Pack // Merino All Season Ankle Socks
Choose any 10 pairs of Socks from 2 color options.





2 Pack // Crew Socks
Choose any 2 pairs of Socks from 2 color options.





3 Pack // Merino All Season Crew Socks
Choose any 3 pairs of Socks from 2 color options.





5 Pack // Merino All Season Crew Socks
Choose any 5 pairs of Socks from 2 color options.





10 Pack // Merino All Season Crew Socks
Choose any 10 pairs of Socks from 2 color options.
What People Are Saying
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- JGJessica G.Verified BuyerReviewingWomen's Merino Bikini Black / XLI recommend this productRated 5 out of 5 stars7/6/25perfect
Super comfortable and dried quickly after a hand wash. Will be perfect for travel.
How did you find the fit?Rated 0.0 on a scale of minus 2 to 2Runs Small True To Size Runs BigWas this helpful? - LSLisa S.Verified BuyerReviewingWomen's Merino Bikini Black / SI recommend this productRated 5 out of 5 stars6/27/25My New Favourite Underwear!
I'm so pleased Unbound Merino finally makes women's underwear! I thought it would be the same material as the men's, but it is slightly thicker and more substantial, both of which are great features. The sizing is true to size and the underwear stays put throughout the day. So pleased to finally have a wool option for under garments. Thank you! I highly recommend both the bikini and the bra. They are super comfortable, breathable and take up next to no space when packing (see photos).
How did you find the fit?Rated 0.0 on a scale of minus 2 to 2Runs Small True To Size Runs BigWas this helpful? - KGkaren G.Verified BuyerReviewingWomen's Merino Bikini Sand / MI recommend this productRated 4 out of 5 stars6/27/25Love merino wool!
I just bought 2 pair to try out before a trip. Seems like they will fit the comfort and quick dry criteria. I would have given five stars, but I am a high rise leg brief girl so wearing bikini is very different for me.
Unbound makes solid quality products. Tip, if you like something then buy it as they can’t stay in stock on products.
How did you find the fit?Rated -1.0 on a scale of minus 2 to 2Runs Small True To Size Runs BigWas this helpful? - PPatriciaVerified BuyerReviewingWomen's Merino ThongRated 3 out of 5 stars6/24/25Too small
Like another person said, the sizing is off. It is difficult to know what size to order based on the sizing description. I am normally a size small on most clothing items, but I ordered a medium. They were still too tight. Too bad you can’t exchange due to being underwear. Maybe a a large would have worked better.
How did you find the fit?Rated -2.0 on a scale of minus 2 to 2Runs Small True To Size Runs BigWas this helpful? - HJHeather J.Verified BuyerReviewingWomen's Merino Bikini Black / SI do not recommend this productRated 2 out of 5 stars6/14/25Tight fit!
This bikini is advertised as "seamless" but it is not. There is a seam and so much elastic mixed in with the merino that the underwear definitely cuts into your fleshy areas. The models must not have any fleshy areas, because these underwear look smooth on them. Sadly, I regret purchasing these underwear, but you can't return something that you've worn, so I am stuck with them. The underwear also fit very small. For reference, I'm 5'4" tall and 127lbs and I wear size Small underwear in every other brand. But Unbound Merino's Small bikini underwear are MINI on me, so tiny that you see the top part of my butt crack.
I love Unbound Merino, but sadly I do not love these underwear.
How did you find the fit?Rated -2.0 on a scale of minus 2 to 2Runs Small True To Size Runs BigWas this helpful?