Independent · Honest · Real-world tested
✓ Verified review | ★ Editor's Pick 2026 | ✓ Teen-tested
We Tested 4 Teen Period Underwear Brands for One Full Cycle Each.
Here's the One My Daughter Asked to Reorder.
Four months, four brands, one teenager who was brutally honest about every single one.
Claire M. ✓ Verified
Mum of two · Manchester, UK · Tested with Sophie, 15
Published May 2026
Claire M. ✓ Verified
Mum of two · Manchester, UK
Tested with Sophie, 15
Published May 2026
Skip straight to the winner →
It started with a text message.
Sophie was in Year 10, double PE on a Tuesday, when her period arrived three days early. She'd been wearing a pad — the same brand I'd used since I was her age — and by lunchtime she'd tied her school jumper around her waist and spent the rest of the day hoping no one would notice. She texted me from the toilets between lessons: I just want to get through PE without checking the back of my leggings every five minutes.
She did go back to class. But something changed that afternoon. I'd seen her manage cramps, manage mood swings, manage the whole arrival of periods with more composure than I ever had at fifteen. What she couldn't manage was the constant background anxiety of waiting for something to go wrong.
I started researching period underwear that same evening. What I quickly found was that everyone had an opinion and almost nobody had actually tested more than one brand properly. So I decided to do it myself. Sophie agreed enthusiastically, which told me how frustrated she was with everything else we'd tried.
"I just want to get through PE without checking the back of my leggings every five minutes."
— Sophie, 15
We tested four brands across four consecutive cycles, one brand per cycle, worn exactly as you would in real life: school days, PE lessons, sleepovers, and nights. Sophie kept a simple daily log. Here's what we found.
Quick Navigation
➠ Why we tested
➠ The 4 brands
➠ School day test
➠ Sleepover test
➠ The winner
➠ Comparison table
➠ All four, scored
➠ FAQ
Why teens need something different
Pads and tampons weren't designed with a fifteen-year-old's Tuesday in mind.
Think about what Sophie's day actually looks like: form time at 8:30, double PE before lunch, then five more hours of sitting, standing, running between lessons, and finally a forty-minute bus home. That's nearly ten hours from leaving the house to getting back. A standard pad was never designed to handle that without a change, and changing in a school toilet, in a cubicle with no bin, while trying not to be late for history, is not a simple thing to ask of a teenager.
Tampons are the other suggestion. Sophie isn't ready. Many girls her age aren't, and that's completely fine. But it leaves a real gap: something reliable enough to last a full school day, discreet enough to look like normal underwear, and comfortable enough that she doesn't spend every lesson distracted.
Period underwear is the obvious answer — in theory. In practice, not all of it delivers. Some brands are too bulky. Some have weaker absorbency than they claim. Some look fine in the photos and feel uncomfortable against the skin. Sophie tried all four. The differences were more significant than I expected.
Why we chose these four brands: We picked WUKA, Modibodi, Flowette and Lunã — four of the most-recommended brands for teen period underwear in the UK, across different price points. Sophie wore each brand for one complete cycle before moving to the next. This is the honest result.
The four brands
The four brands
One cycle each. Four brands. One teenager who told me exactly what she thought.
We tested each brand across a full cycle, typically five to six days for Sophie. She wore the period underwear as her sole protection with no backup pad or liner. Each morning she rated comfort, dryness, and confidence. We took notes after PE, after sleepovers, and after any moment where the underwear was genuinely put to the test.
WUKA | UK's original
Lunã | ★ Winner
Modibodi | Bestseller UK
Flowette | UK DTC brand
Phase 1 — School day wear
Phase 1 — School day wear
First, we put them through the actual school day.
Phase 1 was simple: wear the underwear from getting dressed in the morning until arriving home in the afternoon. That's a minimum of nine hours for Sophie, including PE twice a week. No mid-day changes allowed. She changed into a fresh pair only on sleepover nights. We took notes at lunchtime and after school every day of the cycle.
Lunã — school day
The standout. Sophie wore the boxer on day 1 and 2, her heaviest days, and came home both times having not thought about her period once after putting them on in the morning. No change at lunch. No damp feeling by 3pm. The bamboo fabric was her favourite of the four: noticeably softer than WUKA or Modibodi, and the boxer style moved with her in PE without shifting or bunching. These actually feel like real underwear, she said on day 2.
WUKA — school day
Comfortable from the first wear, which surprised Sophie. She expected it to feel thick. It held well on moderate days. On her heaviest day, day 2, she felt damp by early afternoon and changed at lunch. The sizing ran slightly large — we ordered a Medium and it felt loose during PE, which made her anxious about movement. A solid performer on lighter days, less reliable when flow was heavier and fit wasn't perfect.
Modibodi — school day
Nice looking underwear. Sophie immediately approved of the styles available, and it was comfortable to wear at rest. By mid-morning on a heavy day she noticed the gusset felt wetter than expected. The absorbency did its job, but the moisture-wicking layer wasn't as effective as the marketing suggested. No leaks, but not the dry confident feeling we were looking for. She described it as fine, but I keep thinking about it.
Flowette — school day
The most affordable in our test. On lighter days it performed well and Sophie found it comfortable. On her heaviest day, day 2, she had a leak through to her school trousers at the back, which was stressful. She'd been wearing them for six hours at that point. The underwear feels soft and looks fine. It simply reached its limit before the school day did on that one heavy day. Better suited to lighter days or as backup.
Phase 2 — Sleepover test
Phase 2 — Sleepover test
Then we tested the situations that matter most.
Phase 2 was the harder test. Sophie's best friend had a birthday sleepover, a Friday evening through Saturday morning, and through the testing cycle each brand had to handle an overnight away from home. The overnight test is the one that separates genuinely reliable from good enough for sitting at a desk.
Lunã — overnight
Sophie wore the brief overnight. It held through a heavy night without any issue. She woke up at her friend's house comfortable and dry, with nothing to worry about and nothing to check. It was the first sleepover in a long time where her period simply wasn't part of the morning. She asked if she could keep the Lunã pairs when the testing cycle finished. We ordered more the same week.
WUKA — overnight
Strong overnight. Sophie found the higher absorbency held through the night without a problem on moderate flow. She woke up comfortable with no leaks. Of everything we tried, the overnight performance was where WUKA was at its most reliable.
Modibodi — overnight
The overnight was fine, no leaks, woke up comfortable. Sophie rated Modibodi highly here, and it handled the night away from home without any drama. A dependable choice for overnight wear on moderate flow.
Flowette — overnight
The sleepover was a difficult moment in our test. Sophie woke up on Saturday morning at her friend's house with a leak onto the bedsheets, which was embarrassing and exactly the kind of situation we were trying to avoid. It put her off the brand for overnight use. The brand simply isn't designed for heavy overnight flow, and that's worth knowing before you buy.
"I woke up and didn't have to think about it once."
— Sophie, 15, after her first Lunã sleepover
🏆 Test winner 2026 · Teen period underwear
Lunã: the only brand Sophie asked to reorder.
One full cycle tested. Then she asked if she could keep them.
✓ Bamboo outer with cotton lining, noticeably softer than any other brand we tested
✓ The tested boxer and brief are OEKO-TEX certified and PFAS-free
✓ Held through a full school day and a full night on heavy flow, no changes, no leaks
✓ Boxer style stays in place during PE, gymnastics, and everything in between
✓ Sizes S to 2XL in the teen range, fits real teenage bodies
✓ Fit guarantee: if the size isn't right you can exchange, even after wearing
✓ Usually £30 per pair · Buy 1 get 1 free, effectively £15 per pair
Free UK shipping · Buy 1 get 1 free · Fit guarantee
Comparison table
How the four compared.
Lunã ★
Feature
WUKA
Modibodi
Flowette
✓ Yes
Holds full school day (9h+)
~ Most days
~ Most days
~ Light to moderate days
✓ Yes
Reliable overnight on heavy flow
✓ Yes
✓ Yes
✕ No
✓ Yes
Stays in place
during PE
~ Loose fit
~ Mostly
~ Mostly
✓ Yes
Stays dry-feeling
throughout
~ Moderate days
~ Moderate days
~ Lighter days
✓ Tested boxer & brief
OEKO-TEX certified
✓ Yes
✓ Yes
✕ No
✓ Yes
PFAS-free
✓ Yes
✓ Yes
✓ Yes
✓ Yes
Bamboo construction
~ Teen range: nylon
~ Cotton + merino wool
~ 95% cotton
✓ Yes
Teen sizes S to 2XL
~ 2XS to L only
✓ Yes
✓ Yes
✓ Yes
Fit guarantee
~ 40-day satisfaction
~ 60-day trial
✕ No
~£15 (B1G1 free)
Price per pair (best deal)
£14.99 to £25.99
£17 to £19
£7 to £12
Legend: ✓ passed · ~ mixed · ✕ failed
All four, scored
All four brands, scored
#1 Lunã
lunasperiod.co.uk · Bamboo and cotton teen brief and boxer
🥇 Lunã
Overall score: 9.6 / 10
All-day protection
10/10
Overnight reliability
10/10
PE & movement
10/10
Comfort & fabric
10/10
Dry feeling
9/10
Style & look
8/10
Cons
Pros
✗ Brief and boxer available in black only in these styles. Other Lunã models available in more colours
✗ Teen range is S to 2XL only
✓ Softest fabric of the four, bamboo outer with cotton lining
✓ Held through Sophie's two heaviest days without a change
✓ Boxer style is genuinely stable during gymnastics and PE
✓ Tested boxer and brief are OEKO-TEX certified and PFAS-free
✓ Fit guarantee: exchange even after wearing if the size isn't right
✓ Usually £30 per pair. Buy 1 get 1 free, effectively £15 per pair
Price: Usually £30 per pair. Buy 1 get 1 free, effectively £15 per pair. Free UK shipping.
#2 WUKA
wuka.co.uk · Teen Stretch Seamless range
WUKA
Overall score: 7.3 / 10
All-day protection
7/10
Overnight reliability
9/10
PE & movement
5/10
Comfort & fabric
8/10
Dry feeling
7/10
Style & look
7/10
Cons
Pros
✗ Sizing ran large, felt loose during PE
✗ Teen range is synthetic (80% nylon), adult organic cotton range not available in teen sizes
✗ Felt damp earlier than expected on heavy days
✓ UK's original period underwear brand
✓ Excellent overnight absorbency on heavy flow
✓ OEKO-TEX certified and PFAS-free
Price: £14.99 to £25.99 per pair
#3 Modibodi
modibodi.co.uk · Teen Red range
Modibodi
Overall score: 7.0 / 10
All-day protection
7/10
Overnight reliability
9/10
PE & movement
6/10
Comfort & fabric
7/10
Dry feeling
6/10
Style & look
8/10
Cons
Pros
✗ Moisture-wicking layer underwhelmed on heavier days
✗ Sophie still noticed it during exercise
✗ £17 to £19 per pair with no buy 1 get 1 deal
✓ Best-looking styles of the four, Sophie liked the designs
✓ Solid overnight performance, no leaks
✓ OEKO-TEX certified and PFAS-free
✓ Natural fibres: cotton outer with merino wool absorbent layer
Price: £17 to £19 per pair
#4 Flowette
flowette.co.uk · Teen Range
Flowette
Overall score: 5.8 / 10
All-day protection
5/10
Overnight reliability
4/10
PE & movement
6/10
Comfort & fabric
7/10
Dry feeling
6/10
Style & look
7/10
Cons
Pros
✗ Leaked through school trousers on a heavy day
✗ Leaked overnight during the sleepover test on heavy flow
✗ Better suited to lighter days or as backup protection
✗ Not OEKO-TEX certified
✓ Most affordable brand in the test
✓ Bright colours, teen-friendly designs
✓ Cotton construction, 95% cotton and 5% spandex
✓ PFAS-free
✓ Comfortable on lighter days
Price: £7 to £12 per pair
Closing
It's been a month since we finished testing.
Sophie has worn Lunã every cycle since. She has three pairs now: the boxer for school and PE, the brief for overnight. She hasn't mentioned her period once in the way she used to, that low-level anxious mention where you can hear the worry underneath. Last week she had a two-day school trip. She packed her Lunã pairs without asking me anything. She came home fine.
That's the thing I want other mums to understand. This isn't really about which underwear has the best absorbency statistics. It's about whether your daughter can walk into PE on a heavy day and think about gymnastics, not about what might happen to her leggings. We found the one that does that. It took four cycles and one very patient teenager. I hope this saves you the effort.
FAQ
Yes. In our test, Lunã held through Sophie's two heaviest days without a change from 7am to 4pm. That's nine hours of school including a PE lesson, and she did not need to check once. WUKA and Modibodi held most days but showed more variation on heavy days. Flowette worked well on lighter days but reached its limit on heavier ones.
PFAS became a concern after early period underwear brands were found to contain them. The Lunã boxer and brief we tested are OEKO-TEX certified and PFAS-free, meaning they have been independently tested against over 100 harmful substances. The bamboo and cotton construction is naturally gentler than synthetic fabrics. WUKA and Modibodi are also OEKO-TEX certified and PFAS-free. Flowette is PFAS-free.
The Lunã bamboo fabric includes a moisture-wicking layer that keeps the skin-contact surface dry even as the absorbent layers fill. Sophie's consistent feedback was that she didn't feel wet. She only noticed she was wearing period underwear when she consciously thought about it. This was not the case with Modibodi, where she noticed dampness by mid-morning on heavy days.
The boxer style held up exceptionally well in Sophie's gymnastics sessions. She described it as the first period underwear that didn't need adjusting during exercise. The waistband sits flush and the gusset doesn't shift. For swimming, period underwear is not designed as a replacement for period swimwear. For pool days, a dedicated period swimsuit is the right solution.
Rinse with cold water after removing, then machine wash at 30 degrees without fabric softener. Fabric softener degrades the absorbent layer over time. Air dry or tumble dry on low. Sophie does this herself. It takes about thirty seconds of rinsing and then they go in with her regular wash. After four months of testing the Lunã pairs have not degraded in absorbency or appearance.
Sophie manages with three pairs: two for heavy days and one for lighter days or overnight. With the buy 1 get 1 free offer, buying two pairs gives you four, which is a comfortable rotation for a full cycle without needing to wash every day. That works out to around £30 total at the current deal price.
Lunã offers a fit guarantee. If the size isn't right you can exchange, even after wearing. That matters for period underwear because you genuinely can't know if they fit properly without wearing them. Sizing can be tricky for teenagers whose bodies are still changing, so it's a reassuring safety net when buying for the first time.
Reviews
What other mums said.
★★★★★
"My daughter came home from school on day two of her period and said Mum, these are the ones. I've been trying to find the ones for two years."
— Rachel T. · Verified purchase
★★★★★
"She wore them to a two-day school trip. Didn't text me once to say anything had gone wrong. First time that's happened."
— Gemma W. · Verified purchase
★★★★★
"The bamboo fabric made a real difference. My daughter has sensitive skin and every other brand irritated her within a day. These didn't."
— Louise B. · Verified purchase
The brand Sophie chose.
One full cycle tested. Held through school, PE, overnight, and a sleepover. She reordered before I did.
Usually £30 · Buy 1 get 1 free, effectively £15 per pair · Free UK shipping
What Lunã customers are saying
Verified reviews from Trustpilot . Rated 4.2/5 based on over 44,000 customers
Emma Richardson
“I was honestly surprised by how comfortable Lunã feels. It genuinely feels like normal underwear, but with far better protection than anything I’ve tried before. I’ve worn it on heavier days and didn’t have to worry once.”
Sophie Bennett
“I switched to Lunã after years of using pads, and I wish I had done it sooner. The fit is spot on and it actually keeps me dry all day. It’s also saved me quite a bit of money over the past few months.”
Hannah Collins
“I was a bit sceptical at first, but this completely changed my routine. It feels secure without being thick or uncomfortable, and I don’t get that damp feeling I had with other brands. Definitely sticking with these now.”
Charlotte Hughes
“I’ve tried a few different brands, but Lunã is the only one that ticks every box for me. It’s soft, doesn’t feel bulky, and I feel completely confident wearing it even when I’m out all day. The quality really stands out.”
Rebecca Turner
“What I liked most is how normal they feel. No shifting, no awkward bulk, just reliable protection throughout the day. I’ve already recommended them to a couple of friends.”
Lauren Davies
“I’ve tested a few options and these are by far the most consistent. They hold up well even on longer days, and I don’t feel the need to constantly check or change. It’s made my periods a lot less stressful.”
This review reflects the honest experience of the author and her daughter based on personal testing across four consecutive menstrual cycles during January to April 2026. Scores are subjective and based on one teenager's experience. Individual results will vary depending on flow, fit, and activity level. Period underwear is a personal care product; always follow the manufacturer's care instructions. Pricing correct at time of publication and subject to change.
© 2026 Women's Health Guide. Advertising disclosure: this page contains commercial links to lunasperiod.co.uk.
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