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Build your String Nix drawer
Buy 2 pairs and save £5.98 | buy 3 pairs and save £11.97 | buy 6 pairs and save £23.94
Discount applies automatically at checkout.
Choose your colours and sizes to build your perfect everyday set

Organic cotton thong underwear in Black with a seamless no-VPL fit
Organic Cotton String Thong Black
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Organic Cotton String Thong Black
Organic cotton thong underwear in Almond with a seamless no-VPL fit
Organic Cotton String Thong Almond
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Organic Cotton String Thong Almond
Organic cotton thong underwear in Chocolate with a seamless no-VPL fit
Organic Cotton String Thong Chocolate
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Organic Cotton String Thong Chocolate
Organic cotton thong underwear in White with a seamless no-VPL fit
Organic Cotton String Thong White
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Organic Cotton String Thong White
Organic cotton thong underwear in Caramel with a seamless no-VPL fit
Organic Cotton String Thong Caramel
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Organic Cotton String Thong Caramel
Organic cotton thong underwear in Cinnamon with a seamless no-VPL fit
Organic Cotton String Thong Cinnamon
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Organic Cotton String Thong Cinnamon

Let customers speak for us

from 3 reviews
The Perfect Fit for Active Days

Honestly obsessed with these knickers! The material is incredibly soft, breathable, and feels amazing on the skin. They adjust perfectly to the body without digging in or shifting around. I especially love wearing them to the gym as they stay comfortable and in place no matter the workout. Definitely a staple!

Juliane
04/23/2026
Organic Cotton String Thong Caramel
Organic Cotton String Thong Caramel
The most perfect underwear

Searched for so long to find organic cotton string underwear which wouldn’t show under gym clothes and these guys exceeded. The quality is unmatched. Won’t look back now :)

Jess Hayes
04/14/2026
Organic Cotton String Thong Black
Organic Cotton String Thong Black
Superb quality

Superb quality, and great colours! Long lasting & wash amazingly! Definitely worth the purchase - my first ones are still going years & years later

Liz
03/17/2026
Organic Cotton String Thong Chocolate
Organic Cotton String Thong Chocolate
Love them! Tried and tested

I bought six pairs about a year ago and they have been so good. Really comfortable, soft, and they sit well under clothes without showing. A year on, they are still the pairs I reach for first. I have washed them loads and they have held up far better than I expected. Expensive, yes, but worth it. showing. A year on, they are still the pairs I reach for first. I have washed them loads and they have held up far better than I expected. Expensive, yes, but worth it. e pairs I reach for first. I have washed them loads and they have held up far better than I expected. Expensive, yes, but worth it.

Caroline Aby
03/15/2026
Organic Cotton String Thong White
Organic Cotton String Thong White
Amazing fit, I would definitely recommend!! ❤️

These knickers are made from certified organic cotton and you can really feel the difference, super soft, breathable, and kind to my skin. The fit is amazing even after washing, I’d definitely recommend!! ❤️

Natalie C
10/15/2025
Organic Cotton String Thong White
Organic Cotton String Thong White
Amazing quality and fit!

I was so surprised by our comfortable these are! It’s been so tricky to find knickers that actually sit right and are comfortable - there are spot on. The sizing is well done, and the quality is amazing. All round a great product!

Filipa
09/26/2025
Organic Cotton String Thong Caramel
Organic Cotton String Thong Caramel
A new level of comfort

I’ve got two pairs in different colours - these are the best knickers I’ve got by a long shot. They’re so comfortable, the size fits perfectly and you can feel the fabric quality. I will definitely get more!

Filipa
09/26/2025
Organic Cotton String Thong Black
Organic Cotton String Thong Black
Best String Thong Undies On the Market!

The Almond thong in an 8 is a great fit and true to size, really comfortable and lovely soft material . I’ve been looking for something like this for ages and I’m so glad I found it.

Sally B.
09/26/2025
Organic Cotton String Thong Almond
Organic Cotton String Thong Almond
Amazing pants!

I’ve tried countless undies brands over the years, including some of the big names, and nothing comes close in terms of comfort, fit, and quality.

The organic cotton is lovely and soft without being flimsy, and the recycled elastic, (didn’t even know that was a thing) gives the right amount of support without cutting in.

I like that String Nix is built around everyday luxury essentials. It doesn’t feel like it’s trying too hard, it just is better.

No fast-fashion rubbish just beautifully made Nix and I’ve already recommended them to friends. I’ll be buying more, they are a game-changer.

Lozzzzzurrr
06/24/2025
Organic Cotton String Thong Chocolate
Organic Cotton String Thong Chocolate
So happy to wear them❤️Absolutely love them❤️

I really like this product, they are extremely comfortable and don’t have any VPL at all. Can’t recommend enough, thank you.

Yuna
01/25/2025
Organic Cotton String Thong Black
Organic Cotton String Thong Black
Environmentally conscious

Made with certified organic cotton which is super soft and extremely comfortable to wear.
They are easy to wash and I also put mine to dry in the tumble dryer on a gentle heat, even though it advises you not to tumble dryer them, they were fine, no shrinkage. Highly recommended.

Debbie
01/25/2025
Organic Cotton String Thong Cinnamon
Organic Cotton String Thong Cinnamon
Excellent

I love my Nix, the quality is amazing and so comfortable.

L.A.
10/07/2024
Organic Cotton String Thong Black
Organic Cotton String Thong Black

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