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Heavy
HEAVY
FLOW
Model wearing WUKA Ultimate™ Bikini period pants for heavy flow – full-length front angle showing high-leg cut and comfort waistband.

Ultimate™ Period PantsBikini Brief

Sale price  £103.45 Regular price  £114.95 Saving 10% 10% Off
4.7

Size Chart

 

ULTIMATE, PERFORM, LACE, RE-PURPOSE & BASICS PERIOD PANTS

SIZE
UK
EU
USA
XXS 4-6 30-32 0-1
XS 6-8 32-34 1-2
S 8-10 34-36 2-4 
M 10-12 38-40 6-8
L 12-14 42-44 10-12
XL 14-16 44-46 12-14
2XL 16-18 46-48 14-16
3XL 18-20 48-50 16-18
4XL 20-22 50-52 18-20
5XL 22-24 52-54 20-22
6XL 24-26 54-56 22-24

 

Styles: High Waist, Midi Brief, Bikini, Hipster

 

How to Measure Your Hip Size
Ultimate period underwear size chart showing how to measure chest, underbust, waist, hips, and leg opening for the perfect WUKA fit – get your size right first time for all-day leak-free comfort
WUKA TIP: No tape measure? 
You can measure yourself with a belt or dressing gown cord and a 30cm ruler! Tie the belt around your hips, place a piece of tape or pinch where it reaches, then lay flat and carefully use the ruler to measure the length.

Choose options

Medium
Heavy
Size
Pack Size
Cotton Comfort
Cotton Comfort
Leakproof & Breathable
Leakproof & Breathable
Reusable 2 Years
Reusable 2 Years
Mid Height Gusset
Mid Height Gusset

WHY YOU’LL LOVE IT

WUKA Ultimate™ Bikini Heavy Flow Pants are your complete tampon and pad replacement. With a flattering bikini cut and high-leg style, they look and feel just like your favourite underwear while giving you reliable period protection day and night.

HOW IT WORKS

Each pair absorbs 20ml+ of period blood or light leaks - about 4 tampons’ worth or 3 pads. Built-in leak-proof layers lock in flow and odour, while soft organic cotton keeps you comfortable and fresh for up to 12 hours of wear.

BEST FOR

Heavy flow days, overnight wear, or whenever you want extra coverage with a flattering bikini fit. Perfect for school, work, travel, or relaxing at home.

GOOD TO KNOW

With GOTS-certified organic cotton outer and lining, grown without chemical pesticides, fertilisers, or GM seeds. Wash before first wear. Each pair is reusable for up to 2 years, saving hundreds of disposables from landfill. Breathable, and designed for real life.

Shipping

UK orders usually arrive within 3–5 working days (Express options available), and international shipping is fully tracked from just £5 – £10 via Royal Mail. For our EU customers, we also collect VAT upfront to avoid any surprise fees on delivery.

If it’s your first pair, you’re protected by our 100% Satisfaction Guarantee — try one on, and if it’s not the right fit, you can return or exchange within 40 days. All other items must be unworn and in their original packaging. Once we receive your return, refunds are processed within 10 working days.

See our Shipping Cost and Returns & Refund Policy.

Wash and Care

Rinse, Wash at 40°, air dry inside out. Tested to 54 washes.

Composition

Outer: 92.5% Organic Cotton, 7.5% Elastane
Middle: 88% Polyester, 12% Elastane, TPU
Inner: 95% Organic Cotton, 5% Elastane

FAQ: Ultimate™ Bikini

Bikini-cut period pants in soft organic cotton for heavy flow—comfortable, breathable and protective for up to 12 hours.

How much do the Ultimate™ Bikini Heavy pants hold?
Each pair absorbs 20ml+ (about 4 tampons or 3 pads), ideal for heavy flow days and light leaks.
Do they fully replace pads and tampons?
Yes—on heavy flow days they’re designed to replace pads and tampons. If your flow is very heavy, change sooner or choose a higher-absorbency style.
What’s the fit like and are they comfortable day and night?
A flattering bikini cut with a high-leg shape made from soft, breathable organic cotton that feels like your favourite underwear.
Can I wear them for up to 12 hours or overnight?
They provide up to 12 hours of protection. Suitable for daytime or overnight on heavy flow—change sooner if you start to feel wet, as everyone’s flow is different.
How do I wash and care for them?
Wash before first wear. After use, rinse in cold water until it runs clear, then machine wash at 40°C without fabric conditioner. Air dry only; do not tumble dry or soak for long periods.
How long will they last and how many pairs do I need?
With proper care they’re reusable for up to 2 years. Most people find 5–7 pairs work well for a full cycle; build your rotation with single, 3-pack or 5-pack options.
2024 Health & Wellbeing Awards Gold Winner Badge – recognising WUKA for excellence in health and sustainable period care
Beauty Shortlist Mama & Baby Awards 2024 Winner Badge – celebrating WUKA’s award-winning products for expecting and new mums
Our Stretch Super Heavy Period Pants take home the silver-award at the Green Parent Natural Beauty Awards 2025 for best menstrual care product
WUKA Perform Period Swimsuit wins best value cross-training kit at the Women's Running Awards 2023
Our High Waist Black Seamless Stretch – Super Heavy Flow period-proof underwear wins best period pants at the Beauty Shortlist Wellbeing Awards 2025
WUKA were finalists at the Pure Beauty Global Awards 2025
We won Gen M Award Winner - Breakthrough Partner for our seamless DryTech™ Incontinence light leaks underwear
The WUKA Postpartum Stretch™ set has been voted Best Postpartum Wellness Product for 2025 by The Positive Birth company

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  • 5 stars: 6 (86%)
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  • 3 stars: 1 (14%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
BJess
Comfortable and feeling safe

Both my daughter and I are comfortable and feel safe with this underwear. We've had them for years now. The latest buy was simply to replace some worn out ones.

A
Anonymous
Don’t think twice about buying these!

I bought these for my mid-teen daughter who was conscious of the environmental impact of pads and tampons as well as her own comfort. She loves them. She’s never had a leak, loves the softness of the cotton and is now much happier when she’s out and about knowing that she’s in safe hands wearing her Wuka pants! Keep up the great work!

A
Anonymous
They are amazing and makes you feel free!!

They are amazing!! They really last for long periods of time depending on the flow that you have and also there's no smell. They are really good quality and comfortable to wear as well.

S
Samantha B.

WUKA Ultimate™ Bikini - Heavy

A
A N.C.
Having sizes issues

Trying to get a set of these to fit my daughter. Followed the size chart but they were too big so returned for the next size down and they’re still too big! Can’t afford to keep paying to send them back (recorded delivery as a set is so expensive) so not sure where I’ll go from here. Like the concept, as does my daughter, but this is becoming costly with no reward!

R
Rachel C.
Game changer for peri menopause

Ahh, the period menopause period roulette, scant or tsunami, 6 week, 2 week gap....who knows ?! Wuka are a real game changer . No worrying about leaks, or long train journeys and changing. Waterproof spares bag is excellent quality too. Brilliant products.

K
Kelly S.
Really recommend

Brought this style as I wanted a heavy flow but not massive knickers. They are really comfortable, I wore them from 7am - 8pm and even attended a high intensity rebounding workout. There was no leaking and even with several squats I felt really protected. I am a heavy flow and usually have to change a super plus tampon every 2-3 hours and still wear a pad for back up