On Tuesday, August 25, global intimates brand Knix is asking you to stop trashing your period with the launch of their latest industry-wide innovation: Super Leakproof Underwear. Joanna Griffiths, a pioneer in this space, was one of the first founders to launch reusable Leakproof underwear when she started Knix seven years ago and holds multiple patents. Super Leakproof is the result of ongoing research and development to create one of the most absorbent underwear products in the market. This line of ultra-absorbent underwear is the first of its kind, holding up to 40 ml of liquid (i.e., 8 regular tampons worth), completely replacing the need for disposable period and bladder leak products. This provides consumers with a comfortable menstrual and incontinence product that is both sustainable and environmentally friendly.

“On average, women use between 5,000 and 15,000 disposable period products throughout their lifetime. Super Leakproof has the potential to eliminate this undue waste and flip the $35.4 billion dollar feminine hygiene market on its head,” says CEO & Founder, Joanna Griffiths. “It’s time for women to stop trashing their period, and say goodbye to disposable products, without sacrificing sustainability for reliability.”

Super Leakproof is also the first product that will launch in tandem across Knix and the brand’s young adult line KT by Knix, furthering the company’s mission of encouraging their customers to live unapologetically free, at every stage of life.

Did you know:

  • The average person who experiences menstruation spends around 2,535 days of her life on her period (approximately 7 years)?
  • Knix invented its patented leakproof technology in 2013; now, the category is pacing to become a $500M category by 2023.

Derived from Knix’s signature triple layer technology, the Super Leakproof features moisture-wicking anti-odor carbon cotton, polyester moisture-lock protection, as well as a leak-resistant exterior for superior absorption. Each pair has a multi-layer, ultra-lightweight, and super absorbent extended gusset with full coverage from front to back, and features flat-bonded seams for a smooth silhouette. This innovative patented design is also PFAS-free.

Griffiths founded Knix with the mission of empowering women to be unapologetically free through innovative intimates designed for real life. The brand, which started with leakproof underwear, now sells wireless bras, sports bras, swimwear, loungewear and more. Knix is committed to telling every story, addressing taboos – from the realities of everyday leaks to the changes that bodies go through during pregnancy and nursing, to getting to grips with postpartum life, to embracing gender identity, and life after menopause – and creating real-life products to solve all of life’s needs. A true leader in innovative intimates, Knix also features real women and highlights the beauty of diversity in their advertisements and brand campaigns. The brand has amassed a million customers and on average sells an item every six seconds.

Super Leakproof is available on knix.ca.

Super Leakproof Product Details:

Available in:

  • Bikini ($34) – Absorbs 40 ml/8 tsp of liquid
  • Boyshort ($34) – Absorbs 40 ml/8 tsp of liquid
  • Cheeky ($34) – Absorbs 40 ml/8 tsp of liquid
  • High Rise ($39) – Absorbs 40 ml/8 tsp of liquid
  • Thong ($34) – Absorbs 30 ml/6 tsp of liquid


  • Black, Beige, Sweet Fig and Seaweed (select styles)


  • S – XXXL

Free from PFAS and other chemical treatments
Wash cold, lay flat to dry