Finex is machine-washable and reusable period-absorbing underwear — providing a more sustainable alternative to single-use disposable products. Finex underwear for periods is designed in a range of absorbencies, from lightest to super, to support every stage of your flow. Every pair of Finex period-absorbing underwear features our signature, innovative built-in technology — a moisture-wicking top layer, an absorbent core layer, and an outermost leak-resistant barrier
Our absorbent styles hold from 1 regular tampon worth of flow to 5 regular tampons worth of flow, so there is a style right for each day of your cycle. We recommend trying Finex period-absorbing underwear for the first time at home to see how each underwear style works with your ~flow~
Finex period-absorbing underwear handles blood clots similarly to a pad. Although the undies can't absorb the blood clot itself, they will absorb the surrounding moisture so you will not feel damp, wet, or uncomfortable
Finex period-absorbing underwear is ultra-absorbent, odor-controlling, and moisture-wicking, designed to keep you fresh and dry. If your undies have not reached capacity, we recommend changing once daily, as you would regular underwear. Please note: if your period begins to smell different (unusually fishy), that might mean something is amiss down there, and it might be a good idea to check in with your doctor
Finex period-absorbing underwear isn't stain-proof, though the materials used in our absorbent gusset are largely stain-resistant. Finex is also lined in black to prevent stains from showing. To help avoid staining, we recommend washing your underwear on cold and hang drying
Our period-absorbing underwear is composed of: Body of our Classic: 89% Nylon, 11% Elastane Body of Modal Cotton: 53% Supima Cotton, 35% Lenzing Micro Modal, 12% Elastane Body of Finex air™️: 78% polyamide, 22% elastane Body of Finex for All™: 95% cotton and 5% elastane Gusset for lightest to heavy absorbencies: 95% Cotton, 5% Elastane; middle breathable PUL Gusset for all super absorbencies: 100% polyester; middle breathable PUL For a further breakdown of the materials and fabrics used in our absorbent gussets
Our period-absorbing underwear is 100% latex-free! Our elastane is composed of a long chain polymer known as polyurethane, known in technical circles as a polyether-polyurea copolymer, used for having breathable and water-resistant qualities. Elastane is an entirely synthetic fabric; it does not exist anywhere in nature nor contain organic materials. So: no latex! However, a number of our styles do feature exposed elastic
Yes! We don't apply any perfume or fragrance to any of our materials. All of our products are fragrance-free
We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derriere included! We recommend sizing up in underwear styles that fit below the natural waist. Check the fit details of each underwear style via our size chart. The underwear should fit snugly but not so tight that it becomes uncomfortable
➝ how to use
Depending on your flow, Finex can be a total replacement for disposable products, such as pads, tampons, liners, and cups. Our highest absorbency styles hold up to 5 tampons worth of flow. For most flows, Finex can last all day! Others may choose to carry an extra pair of Finex as a backup, just in case
Every flow is different! You can wear period-absorbing underwear for as long as your flow will allow. And of course, the style you wear also plays a factor, as some underwear styles are more absorbent than others. We measure our underwear for periods by absorbency, with our highest absorbency styles holding up to 5 tampons worth of flow. For some customers, they will last the whole day, and others may need to carry an extra pair of Finex period underwear as a backup. If you feel damp or notice your flow spreading to the seams, that is an indicator you should change into a fresh pair. We suggest bringing along a resealable bag, pouch, or wet bag — so that if you do need to change out of your first pair of Finex undies, you've got a place to put them
One way to tell that your period-absorbing underwear is full is if the side seam of the gusset feels wet. When you start to notice blood at the seams, this is a good indication that it's time to change pairs! We suggest bringing along a resealable bag, pouch, or wet bag — so that if you do need to change out of your first pair of Finex undies, you've got a place to put them
Every pair of Finex period-absorbing underwear features our signature, innovative built-in technology, so we advise against using a pad or liner since these products will cover the gusset and prevent Finex from doing its job
We have heard from parents in our community that they love wearing Finex period-absorbing underwear postpartum! We identified the underwear styles in our collection as most suitable for this time. Finex can provide leak protection you can trust through postpartum and when your period returns. For the best fit during postpartum, we recommend sizing up. Before using any new product, you should check with your doctor to see when our products can best work for you
Yes, we even designed a sleep-specific product! Our indies are boxer-inspired pajama shorts that hold up to 5 regular tampons' worth of flow. We made the Sleep Shorts with an extended gusset to protect against overnight leaks and prevent stains. Other customer favorites for sleeping include our Super Hiphugger and Boyshort
Finex is super simple to care for; wash before first wear and with the rest of your laundry after each use. Hand wash or machine wash cold on a delicate cycle. Your other clothes will be fine, we promise! Just make sure to steer clear of fabric softener and bleach! And last but not least, hang dry your undies
Machine-wash your Thinx on cold. The standard cold wash is 60-80 degrees Fahrenheit (15C - 27C). If you're hand-washing, the water should feel close to room temperature
Nope! Washing Finex with your other laundry is perfectly hygienic, and your other clothes will be fine, we promise! Washing machines will dilute the blood almost immediately, and your other clothes will not stain if you're washing cold
The drying time of our period-absorbing underwear depends on the style — moderate absorbency styles shouldn't take longer than 10-12 hours to dry, and super absorbency styles shouldn't take longer than 19 hours to dry under non-humid conditions. Drying times may be affected by humidity levels and the airflow of the space you hang them in
If your period-absorbing underwear accidentally goes through the dryer, don't stress! Finex can take a tumble or two in a dryer without affecting their integrity. To prolong their lifespan, however, we recommend steering clear of the dryer for the most part. The heat from dryers or irons will hurt the elasticity of the underwear, which is what prevents leaks. Pro tip: use a mesh laundry bag to separate them from your other clothes, so you can easily take them out of the wash while putting your other clothes in the dryer!
Finex will last at its maximum tech performance for the industry standard of about two years or more if cared for properly. To ensure this, wash them on a cold cycle with the rest of your delicates, never use bleach or fabric softener, and always hang drying!
➝ orders + shipping
We accept all major credit cards, Flexible Spending Arrangement (FSA), Health Savings Account (HSA), and Health Reimbursement Arrangement (HRA) credit/debit cards, PayPal, Google Pay, AfterPay
Yes! All new customers are offered free standard shipping on their first order
Order fees include applicable local taxes, duties, and brokerage fees when shipping to the EU, UK, or Canada, though you will be charged VAT at checkout if shipping to the EU or UK. Our prices do not include local taxes, duties, brokerage fees, and VATs for all other countries—you can expect to be charged by the carrier upon arrival. Please make sure you consider all costs before placing an order
Orders are typically processed within 1-2 business days. Standard shipping (Mon-Fri, before 5pm) should arrive within 5-7 business days
We strive to make environmentally preferable choices that don't compromise the integrity of the product that shows up on your doorstep. That means we choose paper and renewable resources as much as possible and work to minimize any plastic or non-renewable materials. Paper: All paper and boards are FSC-certified (both old and new packaging, including inserts and boxes). They are all recyclable and biodegradable! It will take approx. 2-3 months for this process. Polybag: Biodegradable. Strings: Not recyclable but can give to a textile recycler. 65% Polyester and 35% cotton. Mailer bag: Recyclable where plastic films are recyclable. Find a location here. We are currently researching how to use biodegradable and recyclable packaging with soy-based or similar inks, as our supply chain and safe handling requirements allow
