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Welcome to THINX (BTWN)

Start a new cycle with New Moon, a soft heather grey that goes with everything. Snag our new color in every style.

Reusable underwear made with period-proof tech to absorb menstrual flow — so leaks don’t stop you from living your life.

Introducing THINX (BTWN) Sets — two-pair packs (in two *fun* colors!) of your favorite styles. Stock up with Sets for Brief, Bikini, and Shorty and save $$$.

Period-proof underwear that’s made with organic cotton and no extra plastic (better for you and the planet).

Welcome to THINX (BTWN)

Reusable underwear made with period-proof tech to absorb menstrual flow — so leaks don’t stop you from living your life.

(BTWN) — pronounced just like *between*. It’s the space that defines yesterday and today. A moment that unites us. Something we all share.

Period-proof underwear that’s made with organic cotton and no extra plastic (better for you and the planet).

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

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