Our underwear for periods absorbs your flow, helps control odor, wicks moisture, and helps prevent leaks — so you feel fresh, dry, and comfortable throughout the day! No other period products are required. Our period-absorbing underwear is machine washable and reusable— so you can wear, wash, and wear again!

We recommend starting with 3-5 pairs so you’ll be protected for your entire period without doing extra laundry. We offer Saver Sets and Custom Set discounts so you can build your collection and get more for less. Take our Know Your Flow quiz to find which underwear styles work best for your flow!

Wash your period underwear before wearing them. Machine wash with like colors on cold, line dry, and repeat. Do not iron, bleach, or dry clean. Replace your Thinx at 30 washes. Visit our How to Wash page for more details.

Our period-absorbing underwear handles blood clots similarly to a pad. Although the undies can't absorb the blood clot, they'll absorb the surrounding moisture to help you feel fresh and dry.

Follow our simple care instructions to maintain your period underwear's performance. Replace them at 30 washes.

Thinx underwear is safe. Per- and polyfluoroalkyl substances, also known as PFAS, are absolutely not part of our product design and we do not treat our finished products with PFAS. We also take measures to help ensure these substances are not added to our products through material, design, production, facility, and supplier controls. We care deeply about the materials used in our products, putting comfort and safety at the core of our design, development and manufacturing.