The journal

Why the Leakproof Underwear Market Was Crying Out for Annahitah

For too long, leakproof underwear has prioritized function over fashion—bulky, unflattering, and far from stylish. Annahitah is changing the game with Pro Flo, meticulously designed over 18 months to provide seamless, comfortable, and sexy period protection. Unlike other brands, founder Nina tested each style on her own cycle, ensuring real-life performance and a flawless fit. The result? Leakproof underwear women actually want to wear—discreet, stylish, and ultra-functional. Once you try Annahitah, there’s no going back.

Why the Leakproof Underwear Market Was Crying Out for Annahitah

For too long, leakproof underwear has been practical but far from stylish. Bulky, unflattering, and often visible under clothes, most brands seemed to focus solely on function, leaving women with little choice but to sacrifice style for security. That’s where Annahitah stepped in because feeling protected during your period should never mean compromising on looking and feeling amazing.

The Birth of Pro Flo: 18 Months of Perfection

Nina, the founder of Annahitah, knew that women deserved better. She spent 18 months perfecting the most seamless, stylish, and comfortable Pro Flo period and leakproof pants - designed not only for different flows but also for different shapes and sizes. She wanted every woman to have sexy period pants that looked and felt just like their fave  lingerie or everyday underwear.

But getting it right wasn’t easy. Unlike other brands that rush out designs, Nina insisted on testing each style herself - authentically, while on her period. That meant she could only test one new style per cycle, waiting four weeks between each test to truly understand its performance in real-life conditions. This meticulous process ensured that every design was as functional as it was flattering.

Why Women Keep Coming Back

The result? Leakproof underwear you actually want to wear. Annahitah’s sleek, ultra-discreet designs sit seamlessly under tight clothes, gym wear, and even the slinkiest outfits - without bulky seams or telltale panty lines. They perform flawlessly, and they look gorgeous.

That’s why Annahitah boasts five-star Trustpilot reviews and an exceptionally high customer return rate. Once women experience period protection that feels this good, they never go back. 

Better pants. Period.

Nina Alexander
About the author

Nina Alexander

Founder of Annahitah

Nina founded Annahitah to bring more choice, comfort and style to reusable period care. Inspired by her Persian heritage, she created Pro Flo with a focus on women, community and the planet.

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Nina Alexander
Meet the author

Nina Alexander

Founder of Annahitah

Nina founded Annahitah to bring more choice, comfort and style to reusable period care. Inspired by her Persian heritage, she created Pro Flo with a focus on women, community and the planet.

Her founder story explores the idea behind Pro Flo: leakproof underwear designed to feel like the underwear women already enjoy wearing. Through Annahitah, she shares the brand’s perspective on reusable care and the different chapters of womanhood.

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In the journal

Period Pants: The Complete UK GuideHow Do Period Pants Work? The Science of the LayersWhat Are Period Pants Made Of? Materials ExplainedAre Period Pants Hygienic?Can You Wear Period Pants All Day?Do Period Pants Contain Silver? Why We Are Silver-FreeDo Period Pants Contain PFAS? Toxins & Chemical SafetyHow to Choose Period Pants: Flow, Style, Size & LifestyleWhich Absorbency Do I Need? Light to Super Heavy ExplainedPeriod Pants Size Guide: Your Perfect UK Fit (4–18)How Many Period Pants Do I Need?Period Pants Styles Explained: Thong to High-WaistBest Period Pants for Heavy Flow UKBest Period Pants for Sleeping & OvernightBest Period Pants for Sport, Gym & RunningTeen Period Pants & First Periods: The Guide for Girls and ParentsBest Period Pants for School: All-Day ConfidencePeriod Pants for Tweens: Sizing from XXXSFirst Period Kit ChecklistWashable Incontinence Pants: The UK Guide for Bladder LeaksWashable vs Disposable Incontinence Pads & PantsHow Much Liquid Do Leak-Proof Pants Hold?Stress vs Urge Incontinence: Know Your LeakPeriod Pants vs Pads, Tampons, Cups & DiscsPeriod Pants vs PadsPeriod Pants vs TamponsAnnahitah vs Other UK Period Pant BrandsHow to Switch to Period Pants: A 30-Day PlanHow to Wash & Care for Period PantsHow Long Do Period Pants Last?How Period Pants Support Women After Pregnancy and Through PerimenopauseFive Ways to Honour Every Version of YouWhat the Beaver Moon Teaches Us About RestThe Hidden Risks in Period Care: Why It's Time to Demand BetterHow to Handle Heavy Periods with ConfidencePeriod Hygiene Mistakes You Didn't Know You Were MakingEndometriosis: 'It’s Just a Bad Period'—Except It’s Not.The Ultimate Guide to Annahitah Period PantsWhy the Leakproof Underwear Market Was Crying Out for AnnahitahHow a Simple Fact (about tampons) Sparked a Movement