[{"id":261378211915,"handle":"best-selling-collection","title":"Best selling products","updated_at":"2022-05-19T19:20:10+01:00","body_html":null,"published_at":"2021-06-04T13:53:54+01:00","sort_order":"best-selling","template_suffix":null,"disjunctive":false,"rules":[{"column":"variant_price","relation":"greater_than","condition":"0"}],"published_scope":"web"},{"id":260528570443,"handle":"lightest-flow","updated_at":"2022-05-18T21:30:39+01:00","published_at":"2021-03-05T17:17:07+00:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Lightest Flow Period Pants","body_html":"\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\n\u003cspan style=\"color: #8b072f;\" data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003e\n\u003c\/h2\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWhy Choose Our Lightest Flow Period Pants?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eOur \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003elightest\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e flow period pants are best for light leaks or the end of your period. This style of period underwear absorbs up to one tampons' worth of blood or completely replaces pantyliners! Simply w\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eear, wash and reuse.\u003c\/span\u003e\n\u003c\/div\u003e","image":{"created_at":"2021-03-08T17:58:06+00:00","alt":null,"width":76,"height":69,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0072\/6184\/7610\/collections\/1615226284_plad1.png?v=1615226286"}},{"id":260527456331,"handle":"newest-products","title":"New Arrivals","updated_at":"2022-05-19T19:20:10+01:00","body_html":"","published_at":"2021-03-05T16:00:51+00:00","sort_order":"created-desc","template_suffix":"","disjunctive":true,"rules":[{"column":"title","relation":"contains","condition":"Newest"},{"column":"title","relation":"not_contains","condition":"Newest"},{"column":"title","relation":"not_contains","condition":"Mix \u0026 Match"}],"published_scope":"web"},{"id":261378179147,"handle":"new-collection","title":"New products","updated_at":"2022-05-19T19:20:10+01:00","body_html":null,"published_at":"2021-06-04T13:53:53+01:00","sort_order":"created-desc","template_suffix":null,"disjunctive":false,"rules":[{"column":"variant_price","relation":"greater_than","condition":"0"}],"published_scope":"web"},{"id":261222367307,"handle":"thong-period-pants","updated_at":"2022-05-18T21:30:39+01:00","published_at":"2021-05-18T13:54:18+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Period Thongs","body_html":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWhy Choose Our Thong Style Period Pants?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFeel fully protected from light leaks in your favourite underwear style and say goodbye to disposable pantyliners with our sustainable reusable period thongs!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhoever said that you can’t wear a thong on your period? With our super soft and absorbent set of undies you can keep to the style you love, even if you are spotting at the start of your cycle or just finishing the last day or so. These period pants are just right for holding half a tampon or replacing a pantyliner, so if you need to be out and about at any point in the day you can just slip a pair on and head off!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eGone are the days of bulky period products, too ‒ our panties are designed with full seamlessness in mind, so you can wear them under anything you like and they won’t show up at all! Wear them for up to eight hours of leak-free comfort on your lighter days and feel fresh and dry at the end of it, with no one but you the wiser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eHave a look at the period thongs ready to deliver anywhere in the world. You’re guaranteed to find a few pairs that’ll make you say goodbye to disposable pantyliners, for good!\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e"},{"id":261221843019,"handle":"activewear-for-periods","updated_at":"2022-05-18T21:30:39+01:00","published_at":"2021-05-18T13:42:26+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Period Underwear for Sports","body_html":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWhy Choose Our Sport Style Period Pants?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFeel safe and secure when you hit the gym in our period-proof activewear undies! These designs are here to keep you leak-free and feeling clean, even when you’re busy keeping fit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWe know how hard it can be to feel comfortable when you’re exercising in public, especially if you’re on your period. Our super soft, absorbent undies are here to make that feeling a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWith a breathable, moisture-wicking layer to keep you feeling dry and a seamless design that’s perfect for slipping on underneath leggings and jogging gear, these knickers are just right for any kind of exercise you’ve got planned. They’ll also hold between one and four tampon’s worth of flow (and sweat) if you’ve got a long routine planned out.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe antimicrobial features in our undies even means that those smells we all worry about won’t be an issue when you’re already out and about. Then, once you’re back indoors, you can just throw your pair straight in the wash with the rest of your gym clothes!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eKeep feeling your best no matter your flow with our period underwear for sports, exercise, and gym routines. Pick out your perfect pairs and exercise in the comfort you deserve today.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e"},{"id":261221974091,"handle":"sale","updated_at":"2022-05-19T11:50:12+01:00","published_at":"2021-05-18T13:43:52+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Sale Period Pants","body_html":"\u003cdiv style=\"text-align: center;\"\u003eShop our reduced period pants sale and make huge savings. Get them while you can!\u003c\/div\u003e"},{"id":261216632907,"handle":"seamless-collection","updated_at":"2022-05-18T21:30:39+01:00","published_at":"2021-05-17T20:00:21+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Seam Free Period Underwear","body_html":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003ch2 style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\n\u003cspan style=\"color: #8b072f;\"\u003e \u003cstrong data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003e\n\u003c\/h2\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWhy Choose Our Seamless Period Underwear?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eOur seamless period panties are just perfect for any light flow, all while staying as discreet as you need! \u003c\/span\u003e\u003c\/p\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWe all know the feeling of heading out on your period but worrying the whole time about how bulky or noticeable your menstrual products are underneath your clothes. What if you could get a pair or two of knickers that you knew you could easily slip on under any set of clothes you’d like? It’s exactly what you’ll get with these fabulous period pants!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWear any of your favourite dresses, leggings, or skinny jeans without any trouble at all with pairs from this collection. You won’t even notice them once they’re on, which means nobody else will, either!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eIf you’re just on the start or finish of your period, or if you’re on one of your lighter cycles, our undies will be ideal. Holding between half and two tampons’ worth of flow, you’ll find yourself leak-free and covered for spotting for up to eight hours. You’ll be free to go about your day just as you’ve planned, in any outfit you choose!\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eCheck out our seamless period underwear collection and get yourself something you know will suit you nicely, without showing up in the slightest.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003c\/div\u003e"},{"id":261221711947,"handle":"period-pants","updated_at":"2022-05-19T19:20:10+01:00","published_at":"2021-05-18T13:39:44+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Shop All Period Pants","body_html":"\u003ch2 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003ePeriod Pants: Why Choose FLUX Undies?\u003c\/h2\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eWhen you choose to buy period pants from FLUX Undies, you won’t just be getting a new set of super comfy underwear to slip into whenever you feel your period coming. You’ll be getting a sustainably made, environmentally-friendly purchase that’ll even save you money in the long run. One pair of our period-proof panties is designed to be worn for up to 12 hours a day and will last for up to three years, so think of how much you’ll be giving back, both to your budget and to the world.\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eNot only will you be reducing your waste by as much as 99.5%, but you’ll also be getting involved in our donation scheme ‒ for every pair you buy, we’ll provide a reusable period pad for a girl who needs one. We also believe in empowering the people who work with us, as well as our customers, so you can feel confident knowing your favourite pairs of period panties have come from factories with ethical working practices. Change your life, every month. \u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003eWe know that making the switch can be difficult at first, which is why we’d suggest trying your new period panties out at home before replacing your current products completely. You could be changing your life with a new set of super absorbent, fully washable period undies made by us, so why not take a look at the styles we offer and see what you think? Buy a pair or two to get you started and pass the days of your period in clean, comfortable, and completely sustainable style! Delivery across the UK and worldwide.\u003c\/div\u003e"},{"id":261259952203,"handle":"vegan-period-pants","updated_at":"2022-05-19T19:20:10+01:00","published_at":"2021-05-22T17:56:15+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Vegan Period Pants","body_html":"\u003cdiv class=\"Polaris-Layout__Section_1b1h1\" data-mce-fragment=\"1\"\u003e\n\u003ch2 style=\"text-align: center;\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eWhy Choose Our Vegan Period Pants?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003eEvery pair of our period underwear is 100% vegan and cruelty-free. We source natural and sustainable materials for our period pants and never use animal products or test on animals. Shop now for a leak-free and cruelty-free period.\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e"}]
This seamless leak-proof Invisible Thong is perfect for light leaks, sweat, and your lightest days towards the end of your period. Bye-bye pantyliners! Designed with soft, lightweight nylon, they are super stretchy, comfortable and can be worn seamlessly under anything, whilst keeping you leak-free and protected.
The breathable fabric keeps things nice and cool, and of course, our signature built-in tech absorbs moisture and prevents leaks, completely replacing pantyliners and keeping you oh-so-fresh. 🌸
For Periods, Leaks and Incontinence
Holds Half A Tampon or 1 Pantyliner / 3-5ml
Wear For Up To 8 Hours Leak-Free
Soft, Stretchy and Comfortable
Lightweight and Quick-drying
OEKO-Tex Certified Materials
Free From Toxins, Chemicals and PFAS/PFOA
Materials:Body: 95% Nylon5% ElastaneGusset: 100% Cotton, Breathable PUL Packaging: 100% Recycled and Recyclable Cardboard
🍃 Bleed Green:Each pair of our period pants replace 200+ disposables from going to landfill, reducing your waste by 99.5%
🤝 Giving Back:For every purchase, we give back to someone in need. Find out more about our #ByYouForThem giving back schemehere
We offer free shipping on all UK orders and free tracked shipping on International orders over £75.
For same-day dispatch and next day delivery, please place your order before 1pm.
All orders are dispatched from our UK warehouse using trusted couriers such as Royal Mail, DHL and DPD.
Delivery options
UK
DPD Next Day Delivery Service
Next day service, shipped by DPD tracked, £6.95
Royal Mail 1st Class Delivery Service
1-2 days, shipped by Royal Mail tracked, £4.95
FREE Standard Shipping Service
2-3 days, shipped by Royal Mail untracked
EU
*Free standard shipping is offered on all EU orders above £75
Express Tracked Shipping Service
1-2 days, tracked and signed, £14.95
Tracked Shipping Service under £75
3-5 days, tracked, £9.95
FREE Tracked Shipping Service under £75
3-5 days, tracked
USA & Canada
*Free standard shipping is offered on all International orders above £75
Express Tracked Shipping Service
1-3 days, tracked and signed, £19.95
Tracked Shipping Service for orders under £75
5-7 days, tracked, £11.95
FREE Tracked Shipping Service for orders over £75
5-7 days, tracked
Rest of world
*Free standard shipping is offered on all International orders above £75
Express Tracked Shipping Service
1-4 days, tracked and signed, £19.95
Tracked Shipping Service for orders under £75
5-7 days, tracked, £14.95
FREE Tracked Shipping Service for orders over £75
5-7 days, tracked
Think our period pants sound too good to be true? Take them on a risk-free trial for 60 days!
If our undies don't work as promised, let us know within 60 days and we'll refund you, no questions asked. The 60-day risk free trial applies to one worn pair of undies only. Refunds will be paid to the original payment method that was used to place the order.
🚿 Rinse after use.
🧽 Machine wash on 30-40 degrees.
🍃Hang to dry or dry indoors on a radiator.
⚠️ Do not use fabric softener or bleach. No tumble drying.
And that's it! Your FLUX Undies are ready to wear again!
Our Period Pants Are:
Sustainably Manufactured
We only use eco-friendly materials that are sustainably manufactured
Vegan and Cruelty-Free
Made from natural materials and never with animal materials or testing
Free From Nasties
Certified safe for skin and free from toxins, chemicals and fragrances.
60-Day Money Back Guarantee60-Day Money Back Guarantee60-Day Money Back Guarantee60-Day Money Back Guarantee
How They Work
Our period pants absorb up to 5 tampons' worth of liquid, yet they look and feel just like regular undies.
Our built-in tech works like this:
1. Top layer wicks moisture away from the surface quickly, to keep you dry
2. Our middle layers absorb your blood and lock in your flow
3. The bottom layer pushes liquid back up and keeps you leak-free
These are so good, I hate wearing normal pants because of the VPL so these are a great alternative to normal period pants.
M
Marina A. (Nicosia, CY)
Flow:Moderate
Products used:FLUX Undies, obvs!, Disposable pads
Love them!
They work great for lighter flow days, I actually wear them on non-period days as well!!
E
Eve Mcnaghten (York, GB)
Flow:Moderate
Products used:FLUX Undies, obvs!
The best period undies I’ve ever used!
Flux undies have the best period products I’ve ever used. These undies are so comfortable and discrete, il never use another brand.
V
Victoria (Hackney, GB)
Flow:Light
Products used:FLUX Undies, obvs!, Menstrual cup
Great but runs a little small
I love my Flux, they make me feel super comfy and safe when I’m on my period, however I found this style runs quite small and is a bit tight on my hips and tummy (especially with the period bloat..) so I’d recommend going a size up.
M
Macey Naylor (Mitcham, GB)
Flow:Heavy
Products used:FLUX Undies, obvs!, Tampons
Great
I unfortunately realised I was going to be on my period at prom and so I bought this in replacement of a panty liner that I always wear when I have a tampon in, it was great and I felt secure all night and didn’t have to worry about leaking through my tampon or having a visible knicker line
L
Little Mouse73 (Newtownabbey, GB)
Flow:Light
Products used:FLUX Undies, obvs!
Little Mouse73
I bought these thongs to wear with my sport gear and jeggings. The are so so comfortable.
