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Thinx

Direct-to-consumer reusable period underwear

Overview

Thinx makes reusable period underwear that absorbs menstrual flow and prevents leaks, offering a comfortable, fabric-based alternative to pads and tampons. The underwear uses absorbent layers and moisture-wicking fabrics and is worn like regular underwear, washable and reusable with various styles and absorbencies. It sells directly to customers through thinx.com, controlling the shopping experience from selection to delivery and supporting a diversity of users. Its goal is to reduce waste from disposables, improve menstrual health access, and normalize conversations about period care through education and social-impact efforts.

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About Thinx

Simplify's Rating
Why Thinx is rated
C
Rated C on Competitive Edge
Rated B on Growth Potential
Rated D+ on Differentiation

Industries

Social ImpactHealthcareConsumer Goods

Company Size

11-50

Company Stage

Series A

Total Funding

$26.5M

Headquarters

New York City, New York

Founded

2014

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Simplify's take

What believers are saying

  • Butterfly Shorts launched October 2026, expanding Thinx beyond the underwear drawer.
  • Thinx refreshed its core line in April 2024 with LeakSafe™ for 12-hour protection.
  • Retail-scale backing from Kimberly-Clark supports faster product launches and broader shelf access.

What critics are saying

  • The 2023 PFAS settlement still poisons trust and invites renewed testing-driven headlines.
  • Kimberly-Clark can absorb Thinx into Kotex, starving the brand of capital and attention.
  • Single-brand period underwear remains vulnerable if competitors copy LeakSafe™ and undercut prices.

What makes Thinx unique

  • Kimberly-Clark owns Thinx, pairing startup branding with global retail distribution muscle.
  • LeakSafe™ barrier and Butterfly Shorts extend period care into apparel, not just underwear.
  • Thinx sells reusable, machine-washable products with a 45-day trial and broad sizing.

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Funding

Total Funding

$26.5M

Above

Industry Average

Funded Over

2 Rounds

Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Above Average

Industry standards

$15M
$8.2M
$15M
$25M
$30M

Growth & Insights and Company News

6 month growth

0%

1 year growth

-35%

2 year growth

-35%
PR Newswire
Oct 6th, 2026
Thinx introduces Butterfly Shorts, redefining what period underwear can look like.

Thinx introduces Butterfly Shorts, redefining what period underwear can look like. Oct 06, 2026, 06:00 ET The latest Thinx innovation combines leakproof protection and everyday wearability in a style designed to move beyond the underwear drawer. CHICAGO, Oct. 6, 2026 /PRNewswire/ - Thinx, the #1-selling reusable period underwear brand (based on grocery, drug, mass, & dollar units, 52 weeks thru 9/5/26), today announced the launch of Butterfly Shorts, a new category-bending style that blurs the line between apparel and period care. For years, period underwear has largely been positioned as an undergarment. Butterfly Shorts challenge that expectation by combining leakproof protection for up to 12 hours with a fluttery, athletic-inspired silhouette designed to be worn as part of an outfit, not hidden beneath one. Whether heading to a workout, catching a flight, running errands, or simply moving through a busy day, Butterfly Shorts are designed to help consumers spend less time managing their period and more time living their lives. "At Thinx, we believe periods shouldn't limit what's possible," said Nicole Pawlukowsky, vice president of Thinx. "Thinx has been reimagining period care for over a decade. By bringing trusted Thinx protection to athleisure, we're creating a new way to feel comfortable, confident, and ready for whatever the day brings." Style Meets Protection Butterfly Shorts look and feel like everyday athleisure, but behind the design is the trusted protection consumers expect from Thinx. Butterfly Shorts are leakproof for up to 12 hours, are made with Coolcore(TM) breathable mesh fabric, and feature an absorbent gusset designed for overnight protection. Available in sizes XS-4X, Butterfly Shorts are made for real life: morning workouts, long travel days, weekend plans, and everything in between. For consumers who've ever wished period care fit more naturally into their lifestyle, Butterfly Shorts have the answer: dependable protection without sacrificing comfort, movement, or personal style. Period Care, Reimagined Butterfly Shorts are the latest example of the brand's commitment to rethinking what's possible in period care. Building on the success of the Butterfly Shorts style for teens, this new adult offering brings the same combination of protection, comfort, and wearability to a broader audience. The result is a product designed not simply around periods, but around the lives people want to live while having them. Thinx Butterfly Shorts will be available October 6, 2026 at Thinx.com for $56. About Kimberly-Clark Kimberly-Clark (NASDAQ: KMB) and its trusted brands are an indispensable part of life for people in more than 175 countries and territories. Our portfolio of brands, including Huggies, Kleenex, Scott, Kotex, Cottonelle, Poise, Depend, Pull-Ups, Goodnites, Intimus, Plenitud, Sweety, Softex, Viva and WypAll, hold No. 1 or No. 2 share positions in approximately 70 countries. Our company's purpose is to deliver Better Care for a Better World. We are committed to using sustainable practices designed to support a healthy planet, build strong communities, and enable our business to thrive for decades to come. SOURCE Kimberly-Clark

Nonwovens Industry
Mar 18th, 2026
Thinx's limited-time Blood Spell Collection launches.

Thinx's limited-time Blood Spell Collection launches. Leakproof period underwear offers protection for up to 12 hours March 18, 2026 Associate Editor at Nonwovens Industry Launching on March 20 for the Spring Equinox, a season of manifestation and renewal, Thinx is debuting the Blood Spell Collection, its new, limited-time period underwear with actual enchantments cast by a real-life witch. The collection features three themed enchantments, the Confidence Spell, the Money Moves Spell and the Love Spell,created with modern witch @lizzieandthebats. The Blood Spell Collection, offering leakproof protection for up to 12 hours, includes: The Confidence Spell - The Thinx Teens Active Mesh Bikini; The Money Moves Spell - The Thinx for All Everyday Comfort Lace Brief; and The Love Spell - The Thinx Ultra Soft Hi-Waist. The collection will be available for one week only on Thinx.com and TikTok Shop starting March 20, while supplies last.

PR Newswire
Mar 7th, 2025
On International Women'S Day 2025, Antonia Saint Dunbar, Co-Founder Thinx And Antonia Saint Ny, Calls For Industry-Wide Change For Women'S Health In Manufacturing

Disrupting the Status Quo with Women's Footwear: Antonia Saint NY Leads the Charge for Comfort, Health, and Innovation to Empower Women WorldwideNEW YORK, March 7, 2025 /PRNewswire/ -- In honor of International Women's Day, Antonia Saint Dunbar, CEO and Founder of Antonia Saint NY, is calling for a major shift in how products for women are designed and manufactured. A trailblazing entrepreneur and health wellness advocate, Dunbar has dedicated her career to solving real problems for women, first as Co-Founder of THINX, the FemTech leader in the period-proof underwear space, and now as the Chief of Design of Antonia Saint NY, a revolutionary footwear company prioritizing health, comfort, and innovation

PR Newswire
May 1st, 2024
Healthline Announces 2024 Women'S Wellness Awards

Inaugural editor's choice awards celebrate the leading products for women's health and wellnessNEW YORK, May 1, 2024 /PRNewswire/ -- Healthline, the leading source of actionable health education, today announced the 2024 Healthline Awards: Women's Wellness. The awards, which launched in conjunction with Women's Health Month, recognize 23 of the leading brands and products making women's lives better including innovators in fitness, nutrition, sleep and menopause.healthline logo"Navigating the landscape of women's health and wellness products can be overwhelming," said Saralyn Ward NASM-CPT, Healthline senior editor, fitness. "The Healthline Awards for Women's Wellness narrows down the scope by celebrating the best of the industry according to trusted experts in the field."Categories were chosen based on what matters most to women at different stages of their lives and include best multivitamins, best wearable fitness trackers, best breast pumps and best cooling sheets.Healthline's proprietary vetting process is medically-backed and based on proven health benefits, not hype. Products are selected by editors who are experts in their content areas and have first-hand experience using many of the brands and products featured. All recommendations are based on the most up-to-date research and current standards of care; featured brands are reviewed for medical credibility.Winners are listed below in the following categories:NutritionBest Women's Multivitamin: Garden of Life Women's Once DailyBest Probiotic: Ora Lady BugsBest Meal Kit: Blue ApronBest Prepared Meal Delivery: FactorSelf CareBest Wearable Tracker: Garmin FenixBest Period Underwear: Thinx Hi-WaistBest Fitness App: Nike Training ClubBest Meditation App: Healthy MindsBest Sleep Mask: MZoo Sleep MaskBest Magnesium Supplement: Thorne Magnesium BisglycinateBest Weighted Blanket: BearabyBest Body Sunscreen: SuperGoop PLAY SPF 50Best Face Sunscreen: EltaMD UV Clear Broad-Spectrum SPF 46Fertility and MotherhoodBest Prenatal: FullWell Women's PrenatalBest Fertility Monitor: Mira Starter KitBest Fertility Test: Modern Fertility Hormone TestBest Postpartum Hair Loss Product: Nutrafol PostpartumBest Nursing Bra: Kindred Bravely Simply Sublime Nursing BraBest Breast Pump: Spectra 1Best Cordless Breast Pump: Elvie StrideMenopauseBest Multivitamin for Menopause: Thorne Women's Multi 50+Best Cooling Sheets: Quince Organic Percale Sheet setBest Vaginal Moisturizer: Good Clean LoveHealthline's medical experts provided insight on how these products help women take control of their health and wellbeing. The expert panel includes Saralyn Ward, NASM-CPT, Healthline senior editor, fitness; Kelli McGrane, MS, RD, Healthline nutrition editor; Catherine Conelly, Healthline commerce editor; Dr

Fibre2Fashion
Apr 20th, 2024
US' Thinx launches styles offering LeakSafe Barrier technology

Thinx has launched LeakSafe Barrier technology across its product range, providing up to 12-hour leakproof protection.

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