Period underwear has come a long way. Gone are the days of bulky, uncomfortable protection that makes you feel anything but yourself. The NIXI Body Susie Black Leakproof Knicker is the award-winning mid-rise style that has quietly revolutionised how people manage periods, bladder leaks, and everyday discharge — with a design so discreet, comfortable, and effective that once you try it, you’ll wonder how you ever managed without it.
What Makes the Susie Special?
The Susie is built around a four-layer absorbent gusset that holds up to 15ml (2–3 tampons’ worth) of fluid — making it genuinely effective for medium period days and bladder leaks alike. The VPL-free mid-rise design with a comfortable waistband sits invisibly under gym leggings, activewear, and everyday clothing. The outer layer is 75% nylon and 25% elastane for a smooth, second-skin feel; the lining is 95% cotton for breathable comfort; and a waterproof TPU layer ensures nothing gets through. Washable, reusable, and better for you and the planet — the Susie is the smarter choice in every way. Available in sizes from Age 9–10 all the way through to adult sizing.
Real Life Usage Situations
🏋️ The Active Woman & Runner
The Susie was made for movement. Loved by runners and athletes, the VPL-free design sits invisibly under gym leggings and activewear without shifting, bunching, or causing discomfort during high-impact activity. Whether you’re running a 5K, doing a HIIT class, or training for a marathon, the Susie gives you the confidence to push hard without a second thought about leaks. No more planning your training schedule around your cycle.
💼 The Working Woman Who Needs All-Day Confidence
Long days at the office, back-to-back meetings, commutes, and client lunches — the last thing you need is to be distracted by period anxiety. The Susie can be worn alone on medium flow days or alongside a tampon or pad for extra security on heavier days, giving you the flexibility to get through a full working day with complete confidence. The discreet black design means it works under any outfit, from tailored trousers to fitted dresses.
🎙️ The Festival & Long Event Goer
Festivals, long-haul flights, outdoor events, and anywhere that toilet access is limited or inconvenient — the Susie is the practical solution that gives you freedom of movement and peace of mind. Holding up to 3 tampons’ worth of fluid, it buys you the time and flexibility to enjoy the experience without constantly clock-watching for your next bathroom visit.
👧 The Young Person Starting Their Period Journey
For young people aged 9–10 and upwards who are navigating their first periods, the Susie offers a gentle, non-intimidating introduction to period protection. There’s no insertion, no complicated instructions — just comfortable, familiar underwear that happens to protect. The washable and reusable design also teaches sustainable habits from the very start, and the discreet black colour means no visible staining concerns.
🧘 The Postpartum & Perimenopause Stage
Bladder leaks are an incredibly common experience postpartum and during perimenopause — and they’re something that far too few products address with genuine discretion and effectiveness. The Susie’s four-layer absorbent gusset handles bladder leaks with the same effectiveness as period flow, in underwear that looks and feels completely normal. No pads, no bulk, no compromise on how you feel in your own body.
Why £18.00 Is Outstanding Value
Premium period underwear from brands like Modibodi, Thinx, or Wuka regularly retails for £22–£40 per pair. The NIXI Body Susie delivers the same four-layer absorbency, the same VPL-free design, and the same washable reusable construction — with an award-winning pedigree — for just £18.00 per pair. And when you factor in the long-term savings versus disposable pads and tampons — which cost the average person £100–£150 per year — the Susie pays for itself within months. The 3-pack (£45.90) and 5-pack (£72.00) options make the saving even more compelling.
Key Features at a Glance
- Holds up to 15ml (2–3 tampons) — effective for medium period days and bladder leaks
- Four-layer absorbent gusset — discreet, secure, and completely leak-proof
- VPL-free mid-rise design — invisible under gym leggings and activewear
- Waterproof TPU layer — nothing gets through, ever
- Washable & reusable — better for you and the planet
- Loved by runners & athletes — stays in place during high-impact activity
- Available from Age 9–10 through adult sizing — inclusive for every life stage
- Single, 3-pack & 5-pack options — better value the more you buy
Make the Switch Today
The Susie isn’t just underwear — it’s a better way to live. More comfortable, more confident, more sustainable, and more affordable in the long run than anything disposable. At £18.00 for a single pair, or even better value in a 3 or 5-pack, there’s never been a better time to make the switch.
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