I’m a shopping editor at Glamour who’s written extensively about underwear for almost five years now. I’ve tried a lot of styles, including Thinx period underwear. They’re my favorite, and you can save big on them with Thinx promo codes. I hate having to remember whether I’m wearing a tampon, so leakproof undies are a must for me—and many of them, to fit the flow of my cycle. Thinx’s undies are comfortable (they never dig into my skin), high-quality (they don’t fray after multiple washes), and TBH, cute! Sexy, even! They make thongs, and undies with sheer panels. I don’t feel like I’m wearing a diaper in my daily life. I’ve tried many of their styles—their high-rise briefs and bikinis are my favorite. They’re clutch for anyone who has a period, who’s postpartum, has endometriosis, or anyone e;se who experiences spotting (and there are styles for teens, too). I could go on, but let’s cut to the good stuff: There are plenty of fab Thinx promo codes and sales that make stocking up on such gamechanging garments simple. Keep scrolling for the best Thinx deals available now.
Get a $5-off Thinx coupon code and free shipping on your first order.
First-time customers to the brand can save $5 on an order that’s at least $35 using promo code TRYTHINX5 at checkout. It’s a one-time use offer, valid on almost everything at thinx.com (just not gift cards), and available through December 31, 2025. Another way to snag the discount is by signing up for Thinx’s newsletter and texts—after subscribing, you’ll receive a unique code via email. You’ll also stay up to date on new coupon codes, receive exclusive benefits, and have early access to sales. Did we mention you’ll get free shipping too? Just create a Thinx account.
Bundle up to save up to 20%.
Realistically, you won’t just need a single pair of period underwear to get you through a cycle. Thinx’s sets stock you up with multiple undies—and save you up to 20% in the process. You can even create a custom set! You’ll save 10% when you buy four to five pairs of underwear; 15% when you buy five to six pairs; or 20% off seven or more. These deals expire on December 31, 2025.
See if you qualify for a $10 Thinx discount code.
If you’re an educator or, er, an educatee, take an additional $10 off your $35+ order via discount app Student Beans. Receive the student discount here and the teacher discount here (and be sure you’re signed up for the site in order to get it). If you’re a military member, work in healthcare, or are a first responder, you may be eligible for the $10-off Thinx discount as well. Take a look at Student Beans.
Here are tips for saving big at Thinx.
Thinx offers plenty of ways to save if you keep an eye out. During major sale periods, you can score up to 30% off sitewide, with occasional coupon codes offering an extra 30% off—the steepest discounts we’ve seen. You’ll also find BOGO-style deals like “Buy 3, get 1 free” and up to 20% off select underwear sets. All Thinx products (including Thinx Teens and Thinx for All Leaks) are HSA and FSA eligible, so you can use pre-tax dollars to stock up on styles you love—be it a classic black Hiphugger, a sleek Hi-Waist, or something lacy and chic. Perks like free express shipping, holiday gift card discounts, and exclusive promos via newsletters and social media make it even easier to save. Existing customers also get early access to upcoming sales, so staying in the loop definitely pays off.
Take up to 40% off our favorite Thinx period underwear.
Thinx offers a wide range of period-proof essentials starting at just $14, with styles to suit just about every preference and need. Explore a variety of bestselling collections like Thinx Briefs for everyday comfort, Thinx for All for all-in-one protection, and Thinx Sleepwear for leak-proof overnight coverage. If you’re after something minimal, Thinx Thongs deliver discreet protection without the bulk, while Thinx High Rise offers more coverage and support. There’s even Thinx Activewear made to move with you—perfect for workouts or busy days. Save even more with
Get ready for summer with leakproof Thinx swimsuits.
Get ready for summer with Thinx’s latest launch: leakproof period bikinis. Designed to keep you feeling confident and protected while you swim, these bathing suits are perfect for long weekends, beach days, and poolside lounging. The collection combines Thinx’s technology with flattering, functional swim styles—so you can enjoy the water without worry.
How to use a Thinx promo code.
Placing an order with Thinx (and applying a discount) is super simple. Just choose your product’s size and color, click “add to basket,” and head to checkout. On the order summary page, paste your promo code into the “discount code or gift card” box, and click “apply” to see your savings. From there, fill in your contact, delivery, and payment info, then click “pay now” to complete your purchase. Done and done.