Orders, Shipping, & Stuff
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 firstname.lastname@example.org or call us at (917) 819-8171.
For standard shipping, your order should ship within 1-2 business days (Mon-Fri, before 5pm), and arrive within 5-7 business days. For expedited shipping, your order should arrive in 3-5 business days (continental U.S. only). If you pre-ordered an item, the shipping date was indicated when you placed your order.
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.
Custom Saver Sets are a great way for you to build your collection and get more for less. Mix and match any styles, colors, and sizes across all our brands (Thinx, Speax, and Thinx (BTWN)) to take advantage of the following discounts:
Buy 2-3 pairs and save 10%
Buy 4-5 pairs and save 15%
Buy 6+ pairs and save 20%
This discount will apply automatically in your cart and only applies to full price styles. You can return the items individually if they don’t work out.
Saver Sets are a pre-built pack of 2-3 Thinx undies that can be purchased as one item. When you snag a Saver Set, you’re stocking up on your favorite styles *and* saving $$$. These are not eligible for our Custom Set Discount, and undies in a Set can only be returned or exchanged together — not individually.
Yes! We offer international shipping, so people with periods all around the world can period better.
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).
We accept nearly all local currencies. On the off chance we do not accept your local currency, you'll have the option of checking out in USD, CAD, EUR, AUD, or British Pounds. The currency should automatically change based on your location!
While Thinx does its 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!
We are a cash-free establishment, and accept all major credit cards. Thinx gift cards can only be used for online purchases.
Thinx are underwear that absorb your period. Every pair is made with a patented design that's moisture-wicking, odor-controlling, super-absorbent, and leak-resistant. This means they keep you fresh and dry, and are ultra-thin for ultimate comfort. Take a look at our How it Works page to learn more.
Thinx Classic holds up to 2 regular tampons' worth of fluid (18 mL), while Thinx Super holds 4 regular tampons’ worth of fluid (36 mL). Our absorbencies levels vary depending on the style you select. We recommend trying Thinx for the first time at home so you can see how they best work for your body and ~flow~.
Absolutely! We take customer health and safety seriously, which is why our organic cotton products are OCS and GOT-certified, and why all Thinx Inc. products are REACH compliant and undergo testing that complies with the OEKO-TEX standard list of 100 chemicals. We’re proud to say that third party testing has never revealed any harmful chemical levels in Thinx Inc. products.
The only treatments we use on the fabric of the gusset are moisture-wicking and anti-odor, which is OEKO-TEX certified. We consistently test for all known regulated restricted substance for textiles.
Use our handy li'l size chart to figure out your hip and waist measurements, and which size Thinx will be best for you.
Depending on your flow (light, moderate, heavy), Thinx can replace liners, pads, tampons, and cups, or be worn with tampons or cups for extra protection. As we say, ~know your flow~, and try Thinx at home first to see what routine works best for you.
Our undies are made with a patented design that neutralizes bad odors and bacteria. Plus, they are also super-absorbent and sweat-wicking to keep you fresh and dry. Yay!
The wicking layer of our signature period-absorbing technology has an application of non-migratory silver, commonly used in performance wear and medical devices to control odor and the spread of bacteria. “Non-migratory” means it won’t come off your undies and that it only responds to bacteria *on the fabric*, not on your skin (so your vaginal microbiome stays fresh and balanced!).
Our sister brand, Speax, is designed specifically for this purpose! Visit speax.com for more info.
We don’t recommend wearing these undies as a swimsuit because we can’t guarantee the technology will work in the water.
In every pair of Thinx, the layer that sits closest to your skin is made of natural, breathable cotton (ahh, that feels nice). The rest of the absorbent design is held in ultra-thin layers between that cotton interior and the leak-resistant barrier. For Thinx Classic — Gusset: innermost layer is 95% Cotton, 5% Elastane; Middle layer is 95% Cotton, 5% Elastane, and the outermost layer is Breathable PUL (poly jersey). Body: Outermost layer is 85% Nylon, 15% Spandex and the innermost liner is 95% Organic Cotton, 5% Elastane. For Thinx Air — Gusset: innermost layer is 95% Cotton, 5% Elastane; Middle layer is 95% Cotton, 5% Elastane, and the outermost layer is Breathable PUL (poly jersey). Body is 78% Polyamide, 22% Elastane. For Thinx Super — Gusset: 100% Polyester and the outermost layer is Breathable PUL (poly jersey). Body: 95% Organic Cotton, 5% Elastane.
We’re proud to partner with an award-winning, family-run factory in Sri Lanka to give you the most innovation solutions for a better period. Our manufacturing partner is a true expert in production and prioritizes ethical, sustainable product development. Visit our manufacturing page to learn more about Thinx are made, and the incredible people who make them!
Thinx are available for purchase on our website, at select boutique and Nordstrom stores, and at ASOS.com (globally, excluding U.S.). If you'd like to shop Thinx in person, head on over to our store locator to find a store near you.
Like our Classic undies, the gusset in our Organic Cotton line is built to be moisture-wicking, odor-controlling, absorbent, and leak-resistant. The big difference between these two lines is that the body of our Organic Cotton undies is made with—you guessed it!—GOTS-certified organic 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 Organic Cotton line, the body of the undies is made with organic cotton.
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!
Yes, our Organic Cotton line is made with GOTS-certified organic cotton!
Thinx Super holds up to 4 tampons’ worth of your flow, which means that it can be worn without backup period products (i.e., tampons, pads, liners, cups) during your period. This also means that the gusset is a little bit thicker than our Thinx Classic undies, which hold up to 2 tampons’ worth.
Yup. Thinx Super absorbs up to 4 regular tampons’ worth of your flow — all while keeping you fresh, dry, and odor-free.
We recommend Thinx Super for heavier flows and overnight use. If you’ve got a light to moderate flow, or if you’re looking for coverage on your lighter days, we recommend Thinx Classic or Organic Cotton. To get matched with the right Thinx for your period, take our Know Your Flow quiz!
It’s the same deal as all of our period undies! Just machine wash on a cold cycle, and hang dry — avoid fabric softener, bleach, and ironing.
Like all of our undies, Thinx air absorbs your period. The main difference? The body of these undies is made with an ultra-thin, cooling, and sweat-wicking micromesh fabric that keeps you *extra* fresh and dry. We love these for travel and sports especially.
Yes. Check out our Thinx size chart to find the right size for you. (And if the fit isn’t right, don't worry — we've got an easy exchange policy!)
Thinx (BTWN) are period underwear made for young people. Each pair is moisture-wicking, odor-controlling, super-absorbent, leak-resistant—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.
Thinx are engineered for adult bods (people who have already finished puberty), 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.
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.
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.
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 GiveRise, our giveback program. When you purchase from Thinx, you're helping to support our programs and initiatives at GiveRise — where with our partners we're fighting for better access to puberty education, amplifying grassroots activism, and donating our undies and time.
Want to learn more? Visit our GiveRise page!
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.
When we asked our community—made up of fabulous people like you!—they said their biggest concerns when it comes to periods are leaks and leak-anxiety (aka, having the right products to feel fresh, dry, and ready to do the damn thang).
80% of American women have had leaks during, and have expressed anxiety about, their periods.
#Facts: More than 12 *billion* pads and tampons are thrown out every year, and the average person with a period uses 11,000 pads, tampons, and panty liners in their lifetime — that’s a lotta landfill, y’all!
It takes 6 months for a tampon to biodegrade, and pads and applicators sit in landfills for centuries!
We found that 97% of people with periods are willing to try products that are kinder to Mother Nature — so you’re in good company! It’s important to use whatever works best for *you*, but if you want to start reducing your impact, try reusable products (like Thinx undies and re.t.a, our reusable tampon applicator).
Yes. Our affiliate program is managed through Pepperjam. To apply for the program, please sign up here.
With Afterpay, you can buy Thinx now and pay for your order in 4 equal payments made every 2 weeks — no interest added.
After adding Thinx to your cart, choose Afterpay at checkout as your payment method. If this is your first time using Afterpay, you'll be redirected to their website to register and give your payment details. If you've used Afterpay before, just log in to your account. Complete your order, and you're all done! Just remember — all items in your cart must be eligible for Afterpay, and the value must be between $35 and $1,000.
Afterpay can be used for all purchases at shethinx.com — as well as our sister brands Speax and Thinx (BTWN). However, it cannot be used at our retail partners or pop-up locations.
Unfortunately, no — Afterpay is only available to customers in the US
With Afterpay, you'll be required to make your first payment at the time of your purchase. The remaining 3 payments will be deducted automatically in equal installments every 2 weeks from the payment method you've set up. If you want to make a payment before your next installment is due, log in to your Afterpay account — your amount owed will be updated accordingly.
Late fees may apply if you cannot make a payment. Take a look at Afterpay's complete terms and conditions for more details.
Afterpay orders are sent just like our standard US shipping orders, and should get to you within 5-7 business days. Take a look at our complete shipping details for more information.
Yes, Afterpay purchases must be between $35 and $1,000.
You can also use a gift card with Afterpay to pay for your purchase.
Gift cards are not eligible for Afterpay.
You still get our 60-day money-back guarantee if you use Afterpay. If you return an item, we will refund Afterpay and the credit will show up in your Afterpay account. We cannot, however, process an exchange for a purchase made with Afterpay.