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Our Nix

Our collection of String Nix string thong underwear is created for women who expect comfort to feel refined and everyday luxury to feel effortless. Crafted in organic cotton with a flattering, barely there fit, each shade is designed to complement your natural tone.
Six skin tone inspired shades, sizes 8 to 18

Let customers speak for us

from 12 reviews
For all ages!

I recently purchased almond stringnix for my 22 year niece and for her mum. Discreet, comfortable and no vpl..Perfect for every occasion and the quality is amazing

Wendy R
11/15/2025
Organic Cotton String Thong Almond
Organic Cotton String Thong Almond
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
Super, luxurious and comfortable!!

Cannot recommend enough! They wash extremely well, keep their shape and I’m loving them, they are great under fitted trousers/skirts with their seamless look and are super soft

Nicky Peters
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
Comfortable and Eco friendly

I was hesitant to try a new brand of string thong after years of searching for the perfect one, but Stringnix changed my mind. Made from organic cotton and recycled materials, it’s both eco-friendly and incredibly comfortable. It’s also ideal for Pilates and running, offering a seamless, no-VPL fit. I’d recommend sizing down, as the fit is quite generous, especially at the front.

Caroline Dingwall
01/25/2025
Organic Cotton String Thong Black
Organic Cotton String Thong Black
Classy!

Great classy knickers, super comfy and top quality. Going to buy every color !

W.R.
12/31/2024
Organic Cotton String Thong Caramel
Organic Cotton String Thong Caramel
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
Woman modeling String Nix nude seamless thong underwear
Organic Cotton String Thong Almond
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Organic Cotton String Thong Almond
Regular price £29.99
£29.99
Woman modeling String Nix black seamless thong underwear.
Organic Cotton String Thong Black
View options
Organic Cotton String Thong Black
Regular price £29.99
£29.99
Woman modeling String Nix brown seamless thong underwear
Organic Cotton String Thong Caramel
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Organic Cotton String Thong Caramel
Regular price £29.99
£29.99
Woman modeling String Nix chocolate brown seamless thong underwear
Organic Cotton String Thong Chocolate
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Organic Cotton String Thong Chocolate
Regular price £29.99
£29.99
Woman modeling String Nix dark brown seamless thong underwear
Organic Cotton String Thong Cinnamon
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Organic Cotton String Thong Cinnamon
Regular price£0.00 £29.99
£29.99
Woman modeling String Nix white seamless thong underwear
Organic Cotton String Thong White
View options
Organic Cotton String Thong White
Regular price £29.99
£29.99
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