Your hip measurement is the most important size to consider when trying to find the perfect fit.

👇 select a sizecmin

xxs - hip 33-34"

size XXS

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size XXS if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

xs - hip 35-36"

size XS

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size XS if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

s - hip 37-38"

size S

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size S if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

m - hip 39-40"

size M

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size M if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

l - hip 41-42"

size L

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size L if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

xl - hip 43-44½"

size XL

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size XL if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

xxl - hip 45½-47”

size XXL

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size XXL if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

3xl - hip 48-49½”

size 3XL

waist , measured at your natural waist (aka just under your belly button)

hip , measured right around the largest part of your booty 🍑

We recommend size 3XL if you wear jean sizes (US). 👖👌

*Because Thinx uses special technology to keep you leak free, our sizes fit a bit more snug than your average run-of-the-mill undies.

A barely-there fit for lighter days — in cozy organic cotton.

Body: 95% organic cotton, 5% elastane
Gusset: 95% cotton, 5% elastane; middle breathable PUL

To take care of your Thinx, you rinse first , pop ‘em in a mesh laundry bag (this keeps your delicates, ya know, delicate), then cold wash and hang dry . Don’t use bleach or fabric softener! And yes, the rest of your clothes will be fine.

Buy 3+ pairs from any brand and save 10%
Buy 5+ pairs from any brand and save 15%
Buy 7+ pairs from any brand and save 20%
* last call sale items are not eligible for custom set discount