Thinx

Thinx

Direct-to-consumer reusable period underwear

Overview

Thinx makes reusable period underwear that absorbs menstrual flow and prevents leaks, offering a sustainable alternative to pads and tampons. The underwear uses absorbent layers and moisture-wicking fabrics and is worn like regular underwear, washable and reusable. It sells directly to customers via its website and combines product design with social impact initiatives to advance menstrual health and inclusivity. Its goal is to reduce waste, normalize period health conversations, and broaden access to better menstrual products worldwide.

Significant Headcount Growth

About Thinx

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

Industries

Social Impact

Healthcare

Consumer 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

  • Kimberly-Clark's majority stake since 2022 provides distribution and manufacturing scale.
  • Expansion to 60 global retail locations like Nordstrom boosts visibility and sales.
  • LeakSafe absorbs 12 tampons' worth, enabling premium pricing for heavy flows.

What critics are saying

  • Kimberly-Clark prioritizes $20B disposable sales, starving Thinx R&D in 12-24 months.
  • P&G and Unilever leverage 70% market share to undercut Thinx pricing in 12-18 months.
  • Wholesale erodes DTC margins by 40-50% and loses customer data in 6-12 months.

What makes Thinx unique

  • Thinx pioneered reusable period underwear with LeakSafe Barrier technology launched April 2024.
  • Thinx offers sub-brands Thinx, Thinx Teens, and Thinx for All for diverse demographics.
  • Thinx launched Blood Spell Collection March 2026 with witch enchantments on TikTok Shop.

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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
Discord
$15M
Canva
$25M
Thinx
$30M
Kalshi

Growth & Insights and Company News

Headcount

6 month growth

17%

1 year growth

17%

2 year growth

17%
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

Technical Textiles Net
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.

Nonwovens Industry
Apr 18th, 2024
Thinx Launches LeakSafe Barrier Design

Thinx has launched styles of its reusable period underwear featuring its new LeakSafe Barrier technology.

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