Welcome to THINX (BTWN)

How Do They Work?

Our washable, reusable underwear are designed with period-proof technology to help prevent leaks and stains (aka we’ve got your back).

Learn More

How Do They Work?

Our washable, reusable underwear are designed with period-proof technology to help prevent leaks and stains (aka we’ve got your back).

Learn More

Do Anything in (BTWN)

Try THINX (BTWN) for 60 days and if they don’t help you period better we’ll give you a refund — no questions asked!

We're in This Together

Get period info, see new styles, and share what’s on your mind. Follow us on Instagram @THINXBTWN and tell us what makes you #periodproud.

FAQs

( Q )
Are THINX (BTWN) reusable?
( A )
Yes! Our period-proof underwear is washable and reusable. Plus, they’re easy to wash, and when cared for properly can last up to 2 years.
( Q )
Are THINX (BTWN) a replacement for other period products?
( A )
On light days, wear THINX (BTWN) instead of pads and panty liners. On heavy days, wear ‘em as a backup to other products for extra protection.
Got more Qs? We’ve got you covered.
More FAQS