Knix Introduces Super Leakproof Underwear Designed to Replace Disposable Period Products
June 21, 2026
The global intimates brand Knix introduced a major innovation in menstrual care with the launch of its Super Leakproof Underwear, a product designed to eliminate the need for disposable period products while offering comfort, sustainability, and high performance.
The launch represents a significant milestone in the growing movement toward reusable menstrual products. Created by Knix founder and CEO Joanna Griffiths, the new product builds on years of research and development in leakproof technology and aims to provide consumers with a more sustainable and environmentally friendly option for managing periods and bladder leaks.
A New Innovation in Reusable Period Products
Knix first entered the leakproof underwear space in 2013, when Joanna Griffiths introduced one of the earliest versions of reusable leakproof underwear. Since then, the company has continued to develop and refine its technology, securing multiple patents along the way.
The newly launched Super Leakproof Underwear represents the next generation of this innovation. Each pair is designed to absorb up to 40 milliliters of liquid, which is equivalent to approximately eight regular tampons.
This level of absorbency allows the underwear to fully replace disposable products such as tampons, pads, or liners for many users.
The goal behind the product is simple: reduce waste while providing reliable protection.
Addressing the Environmental Impact of Period Products
One of the biggest motivations behind the launch is the environmental impact of disposable menstrual products.
According to Knix, the average person who menstruates will use between 5,000 and 15,000 disposable period products over the course of their lifetime.
These products often end up in landfills and can take decades to break down.
By offering reusable alternatives like Super Leakproof Underwear, Knix hopes to significantly reduce this waste while still delivering the comfort and reliability people expect from modern menstrual care products.
Joanna Griffiths emphasized this mission when discussing the launch.
“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 disrupt the $35.4 billion feminine hygiene market,” Griffiths explained.
She added that the goal is to allow consumers to move away from disposable products without sacrificing performance.
“It’s time for women to stop trashing their period and say goodbye to disposable products without sacrificing sustainability for reliability.”
Advanced Leakproof Technology
The new product is built using Knix’s patented triple-layer technology, designed to deliver high absorbency while maintaining comfort.
The technology includes:
- Moisture-wicking anti-odor carbon cotton
- Polyester moisture-lock protection
- Leak-resistant outer layers
Together, these layers create a highly absorbent yet lightweight structure that helps prevent leaks and keeps the wearer feeling dry.
Each pair also features an extended gusset design, providing full coverage from front to back for extra protection. Flat-bonded seams ensure a smooth silhouette, making the underwear comfortable to wear under everyday clothing.
Additionally, the product is PFAS-free, meaning it is manufactured without certain chemical treatments sometimes found in waterproof textiles.
Expanding Across Multiple Product Lines
The launch of Super Leakproof Underwear also marked the first time a product debuted simultaneously across Knix and the brand’s youth-focused line, KT by Knix.
This approach reflects the company’s broader mission of supporting people through every stage of life—from young adults experiencing their first periods to adults managing menstrual cycles or bladder leaks.
Knix has positioned itself as a brand focused not only on product innovation but also on breaking long-standing taboos surrounding menstruation, postpartum recovery, menopause, and gender identity.
Product Styles, Colors, and Sizes
The Super Leakproof collection launched in several different styles designed to suit different preferences and needs.
Available Styles
- Bikini – $34 (absorbs 40 ml / 8 teaspoons)
- Boyshort – $34 (absorbs 40 ml / 8 teaspoons)
- Cheeky – $34 (absorbs 40 ml / 8 teaspoons)
- High Rise – $39 (absorbs 40 ml / 8 teaspoons)
- Thong – $34 (absorbs 30 ml / 6 teaspoons)
Colors
The collection is available in several colors, including:
- Black
- Beige
- Sweet Fig
- Seaweed (select styles)
Size Range
Knix designed the collection to be inclusive, offering sizes ranging from Small to XXXL.
A Brand Focused on Innovation and Inclusion
Since its founding, Knix has grown into one of the leading brands in the leakproof underwear industry.
What began as a startup focused on solving everyday issues like bladder leaks has expanded into a broader product line that includes:
- Wireless bras
- Sports bras
- Swimwear
- Loungewear
- Maternity and nursing products
The brand is also known for its inclusive marketing campaigns that feature real customers and celebrate diverse body types.
Today, Knix has built a community of over one million customers, with the company reporting that an item sells every six seconds.
A Step Toward a More Sustainable Future
With the launch of Super Leakproof Underwear, Knix continues to push the conversation around sustainable menstrual care forward.
As more consumers seek environmentally friendly alternatives to disposable products, reusable solutions like leakproof underwear are becoming increasingly popular.
The new product line aims to offer a reliable, comfortable, and eco-conscious option for those looking to reduce waste without compromising performance.
Super Leakproof products are available through the brand’s official website at knix.ca.
The Growing Demand for Sustainable Menstrual Care
Since its 2020 launch, Knix’s Super Leakproof Underwear has remained a key part of the growing shift toward reusable menstrual products. As consumers continue to prioritize sustainability and comfort, leakproof underwear has become increasingly mainstream, with more people seeking alternatives to traditional disposable products. Knix has continued to expand its offerings and reinforce its commitment to body inclusivity, innovation, and environmentally conscious solutions, helping to reshape conversations around menstrual care and personal wellness. HOLR has the latest news on how brands like Knix are driving change in the femtech and sustainable fashion industries.
FAQs
What is Knix Super Leakproof Underwear?
Knix Super Leakproof Underwear is reusable period underwear designed to absorb up to 40 ml of liquid, replacing disposable pads and tampons for many users.
How much liquid can Knix Super Leakproof Underwear absorb?
Most styles absorb up to 40 ml, which is roughly equivalent to eight regular tampons.
Is Knix period underwear reusable?
Yes. The underwear is washable and designed for repeated use, offering a more sustainable alternative to disposable menstrual products.
Is Knix Super Leakproof Underwear PFAS-free?
Yes. The collection is made without PFAS chemical treatments.
What sizes are available in the Knix Super Leakproof collection?
The collection is available in sizes ranging from Small to XXXL.
What styles are offered in the Knix Super Leakproof collection?
Available styles include Bikini, Boyshort, Cheeky, High Rise, and Thong options.
Why are reusable period products becoming more popular?
Consumers are increasingly seeking sustainable, comfortable, and cost-effective alternatives to disposable menstrual products.