[{"id":261236129867,"handle":"best-sellers","updated_at":"2022-01-25T15:25:21+00:00","published_at":"2021-05-20T15:17:10+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Best Sellers","body_html":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: #8b072f;\"\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eShop our best-selling period pants for a leak-free comfy period.\u003c\/span\u003e\n\u003c\/div\u003e"},{"id":261378211915,"handle":"best-selling-collection","title":"Best selling products","updated_at":"2022-01-25T15:25:21+00:00","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":260527456331,"handle":"newest-products","title":"New Arrivals","updated_at":"2022-01-25T15:25:21+00:00","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":261221744715,"handle":"new-arrivals","updated_at":"2022-01-25T13:05:37+00:00","published_at":"2021-05-18T13:39:58+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"New Arrivals","body_html":""},{"id":261378179147,"handle":"new-collection","title":"New products","updated_at":"2022-01-25T15:25:21+00:00","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":261222301771,"handle":"boxer-short","updated_at":"2022-01-25T13:05:37+00:00","published_at":"2021-05-18T13:53:47+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Period Boxers","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 Boxer Style Period Pants?\u003c\/span\u003e\u003c\/h2\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\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-fragment=\"1\" data-mce-style=\"font-weight: 400;\"\u003eYour days and nights are covered with our period boxer shorts. Find a super soft set that keeps you feeling free and fresh throughout your cycle here!\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 know all about staying comfortable on days that make that a little bit more difficult. Our period boxers are here to help when those days come around, with their ultra-absorbent, moisture-wicking layers. These will hold between four and five tampons’ worth of menstrual flow and keep you feeling dry through the day. \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;\"\u003eYou can even wear these shorts straight to bed and wake up feeling just as fresh as you did when you went to sleep! All you’ll need to do is change into a new pair when you get dressed and throw the old pair in the wash before you head off to start your schedule.\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;\"\u003eThink of how many menstrual products you’ll save from the landfill by picking out your perfect pairs of reusable boxer shorts to wear overnight as well as during the day? Not only will you feel soft and secure in your undies, you’ll also be staying eco-friendly!\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;\"\u003eHave a look at the designs we’ve got for sale and find those comfy, cosy sets that’ll keep you secure in yourself during the day, while helping to save the planet.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003c\/div\u003e"},{"id":261222432843,"handle":"night-period-pants","updated_at":"2022-01-25T13:05:37+00:00","published_at":"2021-05-18T13:55:04+01:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Period Pyjama Shorts","body_html":"\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv class=\"g\" data-mce-fragment=\"1\"\u003e\n\u003cdiv data-hveid=\"CAQQAA\" data-ved=\"2ahUKEwiLu_P_o9PwAhXXgVwKHaWeAxkQFSgAMAB6BAgEEAA\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"tF2Cxc\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"IsZvec\" style=\"text-align: center;\" data-mce-fragment=\"1\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: #8b072f;\"\u003e\u003c\/span\u003e\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 Sleep Short Period Pants?\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;\"\u003eNever worry about leaks in the night or stains on your sheets again with our super-absorbent sleep shorts!\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’ve all had that frustration at one point or another: going to bed on our periods, leaking in our sleep, and waking up to unwelcome stains on our sheets. But with these night time period pants, you’ll never have to think about this happening again!\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;\"\u003eOur super soft, sleep short style undies are designed to hold up to five tampons’ worth of menstrual flow without leaking. This means you can wear them comfortably all night without worrying about what you’ll find in the morning. The clever moisture wicking layer built into each pair should also leave you feeling as fresh and dry as when you went to bed!\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;\"\u003eThe last thing sleeping should ever do is cause you stress or discomfort, so we’ve done everything we can to keep your sleep shorts as comfy to wear as possible. Just slip them on under your favourite oversized shirt or pair of pyjamas and you’ll be ready for some well-deserved rest and relaxation.\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;\"\u003eTake a look at our period pyjama shorts and rest easy all night long.\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e"},{"id":261221711947,"handle":"period-pants","updated_at":"2022-01-25T15:25:21+00:00","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":260527358027,"handle":"super-heavy-flow","updated_at":"2022-01-25T13:05:37+00:00","published_at":"2021-03-05T15:54:15+00:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"Super Heavy Flow Period Pants","body_html":"\u003cmeta charset=\"utf-8\"\u003e\n\u003ch2 style=\"text-align: center;\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-weight: 400;\" data-mce-style=\"font-weight: 400;\" data-mce-fragment=\"1\"\u003eWhy Choose Our Super Heavy Flow Period Pants?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eOur \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003esuper-heavy\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e flow period pants absorb up to five\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e tampons' worth of blood for up to 12 \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003ehours or all night. Best for sleeping in or lounging around the house. If you're looking for period underwear that keeps you and your sheets dry and leak-free, look no further. Simply wear, wash and reuse.\u003c\/span\u003e\u003c\/p\u003e","image":{"created_at":"2021-03-18T12:29:28+00:00","alt":null,"width":76,"height":69,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0072\/6184\/7610\/collections\/1616070567_1616070544_1615224047_1615224007_1614987529_1614987449_1614987434_rain4red.png?v=1616070569"}},{"id":261259952203,"handle":"vegan-period-pants","updated_at":"2022-01-25T15:25:21+00:00","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"}]
These comfy Sleep Short style period undies are built with super absorbency to keep you protected all night long. With a protective layer offering extra coverage from front to back, you can rest assured you'll be protected from stained sheets and midnight leaks!
Our super-heavy Sleep Shorts hold up to 5 tampons worth (that's our most absorbent yet!)
Classic, comfortable cotton
Holds 5 tampons' worth or 25-30ml
Wear all night on super heavy flow
For periods, leaks & incontinence
Protection layer from front to back
OEKO-Tex certified materials
🍃 Bleed Green: Each pair of 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 scheme here
We offer free shipping on all UK orders and free 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.
Christmas 2021 deliveries
UK
DPD Next Day Delivery Service
Next day service, order by 12pm 23rd December, £6.95
Royal Mail 1st Class Delivery Service
1-2 days, order by 12pm 22nd December, £4.95
FREE Standard Shipping Service
2 days, order by 12pm 22nd December, FREE
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 £50
Express Tracked Shipping Service
1-2 days, tracked and signed, £14.95
Tracked Shipping Service
3-5 days, tracked, £9.95
Standard Shipping Service
3-5 days, untracked, £4.95 (or free on orders above £50)
USA & Canada
*Free standard shipping is offered on all International orders above £100
Express Tracked Shipping Service
1-3 days, tracked and signed, £19.95
Tracked Shipping Service
5-7 days, tracked, £11.95
Standard Shipping Service
5-7 days, untracked, £8.95 (or free on orders above £100)
Rest of world
*Free standard shipping is offered on all International orders above £150
Express Tracked Shipping Service
1-4 days, tracked and signed, £19.95
Tracked Shipping Service
5-7 days, tracked, £14.95
Standard Shipping Service
5-7 days, untracked, £8.95 (or free on orders above £150)
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
I wish I’d tried these sooner. I have very heavy periods and however careful I am I always end up with bloody sheets! Not any more. Period pants are the way forward. I’m using with tampons which I still change at night but don’t have to worry about leakage now, or adding more plasticky sanitary towels to landfill. Also much more comfortable. Give them a go! I might get more for daytime use too.
J
Judith (Oxford, GB)
Flow:Super Heavy, Heavy
Products used:FLUX Undies, obvs!, Disposable pads
Game changer
I love flux undies - in everyday life but also both at night and when exercising while on my period I have a lot less anxiety about 'leakage'.
N
Nicola W (Preston, GB)
Flow:Super Heavy
Products used:FLUX Undies, obvs!, Cloth pads, Menstrual cup
These undies are a period game changer
Flux undies are easily one of the best investments I've made. No more leaks!! Even on stupid heavy days/nights. Very comfy. Just soak undies after use overnight in a covered bucket of water then pop in washer when done. They do take a couple of days to fully air dry but it's honestly not a problem. Wish they'd been available years ago. Totally game changing. I no longer dread my periods. Plus, no more I'll fitting disposable pads from me clogging up landfill!
I am really happy with my purchase of flux undies. They're super comfortable and fit well. Helpful if you have a heavy period, no need to worry about leaks especially at night. Will be purchasing more in the future. Plus, a bonus is that they are a good eco alternative to other products. So a win win.
