Previous
Next

Welcome to
Thinx (BTWN)

Our best-selling Fresh Start Period Kit — with a twist! Shop the updated Kit, featuring undies more absorbent than ever.

Our *first* EveryBody design contest print is here! Shop our limited edition Go With the Flow print, and help us empower the next generation to period better.

First periods don’t have to be awkward — they’re just a part of *glowing* up. Snag Glow Up, our splashy new hue, in every style. 🧡💙

Welcome to
Thinx (BTWN)

Our best-selling Fresh Start Period Kit — with a twist!
Shop the updated Kit.

Our *first* EveryBody design contest print is here! Shop our limited edition Go With the Flow print.

First periods don’t have to be awkward — they’re just a part of *glowing* up.

Period-proof underwear for tweens and teens

Fresh Start Period Kit

Bikini

Brief

Shorty

Shop all

How do they work?

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