Orders, shipping, & stuff

I’ve already submitted my order, but I need to make a change! What do I do? Is it too late?

We process our orders quickly (so you can get your undies in a jiff), but we will do our best to accommodate any requests you may have. The best way to adjust or cancel an order is to email hello@shethinx.com or call us at (917) 819-8171.

How long must I wait for my undies after I submit my order?

Your order should ship within 1-2 business days (Mon-Fri, before 5pm), and arrive within 5-7 business days if you select standard shipping, or 1-3 business days with expedited shipping (Continental U.S.)––UNLESS you've pre-ordered something, in which case the shipping date was indicated upon placing your order.

What is your return policy?

Not loving them? No worries — we process returns and exchanges within 60 days of purchase (not valid on final sale items, tampons, merch, or gift cards), no questions asked! We will also provide you with a free pre-paid return label. You can request a return or exchange via returns.shethinx.com. If your order qualifies, you'll receive an instant refund code (enter it at checkout). Your instant refund code will allow you to shop again immediately. Just remember to send your items back within 30 days or you'll be charged for the purchase. If you want to buy a different style, use your instant refund code and the provided free shipping code to re-purchase (we can only process direct exchanges for different sizes and colors of the same style through our portal). If you prefer a monetary refund, the instant refund code will automatically expire in 5 business days, and you'll receive a monetary refund within 5 days of your items being received by our warehouse.

I live abroad. Can I still order THINX?

Yes! We offer international shipping, so women all around the world can feel comfortable and confident during their periods!

Does THINX cover taxes, duty, etc. for international customers?

Unfortunately, our prices don't include local taxes, duties, brokerage fees, and VATs, all the stuff you may be charged to receive your THINX shipment at home. *Make sure you consider all fees,* because once your order arrives you'll be required to pay all taxes, duties, etc. (we won't be able to refund you if you change your mind).

What currency do y'all accept?

We currently accept USD, AUD, CAD, and British Pounds. The currency should automatically change based on your location!

I'm having trouble placing my order on your website. Help!

While THINX does it's best to ensure that our E-commerce experience is consistent, enjoyable, and functional across all modern browsers and devices, occasionally something small may not function properly on older browsers when an update to our code is pushed. If you are having trouble logging in, creating an account, or placing an order, we highly recommend you first update your browser to the newest version.
Chrome  |   Firefox  |   Safari  |   Internet Explorer
Or, simply trying another browser will usually work too! We prefer Chrome here at THINX!
We apologize for any inconvenience. If you still need help or are experiencing issues, please don't hesitate to contact us!

Product Knowledge

How do THINX work?

Our signature technology made up of four ultra-thin micro-layers that all work together to do their thang. We developed the technology over three years before launching the product to ensure each and every pair is completely antimicrobial, moisture-wicking, leak-resistant, and absorbent. Take a look at our How it Works page to learn more.

How much liquid can THINX hold?

Your THINX can hold up to 2 regular tampons’ worth of liquid (10 mL worth), but this can vary depending on the style you’ve chosen, and what your flow is like.


Yup. Check the shop page to see all our styles.

How do I pick the right size underwear?

Use our handy li'l size chart to figure out your hip and waist measurements, and which size THINX will be best for you.

Are THINX a replacement for my current routine?

THINX replaces panty liners for good, and can be used in conjunction with tampons and menstrual cups. You know our flow though, so we suggest testing your own limits.

Is THINX hygienic?

Fo’ sho. The entire inner lining is treated with an anti-microbial application of silver, which becomes embedded within the fibers and fights bacteria. Our super-absorbent and sweat-wicking materials work with the rest of the four-layer tech to keep you dry and germ-free. Yay.

How do I wash my underwear?

We recommend that you rinse them by hand first, and then throw them in the cold wash with the rest of your delicates! DON’T use fabric softener as it prevents the antimicrobial and moisture-wicking treatments from working. Finally, hang dry. (Pro-tip: You should treat the rest of your lingerie like this, too!)

Can THINX be used for urinary incontinence or light bladder leaks?

We actually have a product called Icon that’s designed specifically for this purpose! Visit iconundies.com for more info.

What are THINX (BTWN)?

THINX (BTWN) are period-proof underwear made for young people. Each pair has 4 layers of special technology—moisture-wicking cotton, odor-trapping lining, super-absorbent fabric, leak-resistant barrier—to help prevent leaks, stains, and smells. Best of all, they come in full-coverage styles and fun colors that fit teen and tween bodies.

What if I fit both THINX and THINX (BTWN)?

THINX are engineered for adult bods (you know, people who have already done the whole puberty thang), and THINX (BTWN) are made for teen and tween body shapes and sizes. If you need help deciding what’s best for you, just give us a holler.

Do THINX and THINX (BTWN) have the same absorbency levels?

THINX styles offer a range of absorbency levels so you can pick and choose what works best with your flow. All THINX (BTWN) styles have the maximum level of absorbency to better support young people who have inconsistent and uneven first and early periods.

What's the difference between THINX and THINX (BTWN) styles?

All THINX (BTWN) styles are full-coverage, so they’ve got young people’s backs through long school days, sports practices, club meetings, and beyond — without feeling bulky or wet. THINX come in a variety of styles (from barely there thongs to super-comfy boyshorts) so you can match your underwear to your period #mood.

Can I wear THINX as a swimsuit?

We don’t recommend wearing these undies as a swimsuit because we can’t guarantee the technology will work in the water.

I have sensitive skin. What are THINX made out of? Will they irritate me?

The interior of the underwear is antimicrobial cotton, which includes an application of silver. All the other technology is between the cotton interior layer and the nylon/spandex exterior layer (Interior Innermost 95% Cotton, 5% Elastane; Middle breathable PUL, 95% Cotton, 5% Elastane; Outer 89% Nylon, 11% Elastane; Trim 100% Polyester). This way, your undies look sexy but feel safe!

Where are THINX manufactured?

Each pair of THINX is made at a family-run factory in Sri Lanka. They are true experts in production and can offer the best quality to all our loyal THINX-ers. The best part, though? THINX is made by empowered women––learn more on our About page.

Where can I buy THINX?

Right here! THINX is currently only available for purchase online at shethinx.com, so that we can make sure you fully understand the product, our giveback, and also get the best customer experience possible.


What’s the difference between your Cotton undies and Original undies?

Like our Original undies, the gusset in our organic Cotton line has our signature 4-layer leak-resistant tech. With our new cotton line, the body of the undies is now made with organic cotton.

I thought your undies were always made with cotton?

Yes, the top layer of our gusset (the part that sits closest to your V) has always been made with cotton, but with our new Cotton line, the body of the undies is now made with organic cotton.

Is the sizing of your Cotton undies the same?

Yes, check out our size chart for help selecting your THINX. And if the fit isn’t right don't worry — we have a super-easy exchange policy!

Are they organic?

Yes, our Cotton range is made with organic cotton.


How does THINX help underserved communities?

Giving back to people with periods has been at the core of our mission since day 1 — but we know there’s still a lot of work to do (like more education, accessibility, and resources!). That’s why we’re committed to paying it forward through our giveback programs. The best part is that we’re doing it with *your* support! A portion of every THINX purchase helps fund our giveback initiatives near and far. Wanna learn more? Email our giveback team at giveback@shethinx.com.


I love the product. Can I sell THINX in my store?

Thanks for the support! Our biz is *growing*, and because of the massive interest in our innovative period solutions we're launching a wholesale channel. Interested in selling our stuff? Fill out the contact form below.

Period Facts

How many women have accidents during their periods?

80% of American women have had accidents during, and have expressed anxiety about, their periods.

How many tampons and pads does a woman use during her lifetime?

Approximately 17,000.

How many pairs of underwear does a woman throw away each year?

5 or more pairs of underwear are typically thrown away by one woman every year.


Hold up — I thought you sold period underwear so I don't need to wear tampons? Care to explain, THINX?

Fair question, curious customer! Tampons make the perfect backup to your THINX on a heavy day. When you need extra support, the tampons will help THINX with the heavy lifting (or in this case--absorbing!)

What are these tampons made out of?

THINX tampons are made of 100% organic cotton. Ya know how good you feel when your drink is 100% juice? Yeah, it’s kinda like that!

How much blood does the tampon hold?

The THINX Regular tampon holds 6-9g, and the Super 9-12g.

How often should I change my tampon?

The FDA recommends that you change your tampon every 4-8 hours, but as we like to say, #knowyourflow!

Are your tampons FDA approved?

Yes! 3 cheers for putting safe materials in our bodies!

Where are the tampons made?

THINX tampons are made at a family-run factory in Spain. Viva la vagina!

So what's the deal with this applicator?

We can’t reveal •too• much now, but here’s a hint: sustainable, reusable, & your new favorite accessory!

Referral & Affiliate

Do you have a referral program?

Yup! Every friend you refer saves $10, and once they purchase, we'll send you a $10 code too! Check it out.

What about an affiliate program?

Yes. Our affiliate program is managed through Pepperjam. To apply for the program, please sign up here.

Got more questions?
email us at hello@shethinx.com
call (917) 819-8171