From features and insertion to removal, get the lowdown on Flex Cup


The only cup in the world that removes like a tampon. With a patented pull-tab that breaks the seal for easy removal, Flex Cup is the #1 menstrual cup for a reason.

How to use a menstrual cup

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Meet Flex Cup

It’s the menstrual cup you know and love, but with one major upgrade: Flex Cup changes the period cup game with its patented pull-tab that makes removal easier than ever (and 100% suction-free).

Made with medical-grade silicone and without BPAs, phthalates, or natural rubber latex, Flex Cup is the easy and sustainable tampon alternative you’ve been searching for. It’s reusable, stain-proof, and doesn’t absorb odor—plus, it’s engineered with just enough rigidity to make insertion a breeze.

Insertion, wear, and removal



Clean your cup. If it’s your first time using your Flex Cup, give it a quick wash with a mild soap or Flex Foaming Cup Wash. To completely sanitize your cup in between periods, you can boil it for 10 minutes on the stove (but keep an eye on it while doing so and do not allow your cup to come in contact with the sides of the pot).


Experiment with folding techniques.There are lots of different ways you can fold your cup for insertion but one of our favorites is called the punchdown fold. To do it, simply push one side of the cup’s rim down towards the base with your thumb, then pinch the sides together.


Get into a comfortable position. Either sitting on the toilet, standing with one leg elevated, or squatting with knees wide—and take a breath to relax your pelvic floor. While holding the cup in its folded position, insert it into the vaginal canal. You don’t have to push it too far back (and it’s normal for the pull-tab to hang slightly outside your body).


To make sure the cup has popped open fully, insert a finger into your vagina and run it around the outside of the cup, feeling for any pleats or indentations. If you notice any, try twisting the cup slightly or pressing gently against your vaginal walls to help it open up. You’ll know your cup is in the right place when you can get up and move around without leaks or discomfort.



Go about your day! Wear Flex Cup for up to 12 hours at a time. Since Slim Fit has the capacity of two super tampons and Full Fit holds as much as three super tampons, you’ll be covered for hours (even on your heavy days).



When you’re ready to remove your cup, start by washing your hands. Hop on the toilet or remove your cup while showering for 100% mess-free removal. Then, simply reach for the pull-tab and grab (or loop your finger through) while pulling down gently. The pull-tab breaks the seal for you, helping the cup slide out easily. Be careful not to pull too hard or too fast to avoid spills.



Dump the contents of the cup into the toilet and then take it to the sink for a rinse. Whenever possible, wash your cup with a mild soap—or with specially-formulated Flex Foaming Cup Wash—before reinserting. If you’re out and about with no access to a sink, use Flex Biodegradable Wipes (they’re plant-based and flushable!) to clean off your cup before reinserting.

View the official Flex Cup Instructions for Use.

Remove cup

Flex Cup pro-tips

Insert the cup low

Insert the cup low. Flex Cup does not need to sit super high up in the vaginal canal. How far up it should go depends on your unique anatomy and personal preference: Just make sure that the cup has enough room to pop open all the way. For some, Flex Cup might only need to be inserted about a knuckle deep. If the pull-tab hangs outside your body, you can twist it so that the ring lies parallel to your labia for added comfort. You can also tuck the pull-tab up into your vaginal canal, so it sits alongside the cup.

Twist to place

Twist to place. Pinch and twist the base of the cup as you insert it. This will set the cup into place, help it pop open, and ensure it's properly sealed against the vaginal walls. To be extra sure you’re protected against leaks, run a finger around the base of the cup once it's comfortably positioned.

Use wipes to clean your cup in public restrooms

Use wipes to clean your cup in public restrooms. If you’d rather not walk your cup to the row of sinks in a public restroom (we get it!), you can easily clean it off while in the toilet stall with a pack of Flex Biodegradable Wipes. First, just dump the contents of the cup into the toilet. Grab a wipe and go over the inside and outside of the cup—you can unthread the pull-tab if you’d like. Once that’s done, use an extra wipe to clean your fingers, reinsert the cup, and you’re good to go!

Is Flex right for you? Take our quiz!

Is Flex right for you? Take our quiz!

Is Flex right for you? Take our quiz!

Is Flex right for you? Take our quiz!

Is Flex right for you? Take our quiz!

Is Flex right for you? Take our quiz!


Why is my menstrual cup leaking?

There are three main reasons for menstrual cup leakage: Your cup may not have popped open all the way during insertion, it may be inserted too high or too low, or it may be the wrong size.

To check that your Flex Cup has fully popped open once inserted, run a finger all the way around the base of the cup. If you can feel any dimpling or folding, you may need to remove your cup and reinsert (we recommend the punch-down fold for beginners). Next, make sure your cup isn’t inserted too high up in the vaginal canal: For a comfortable fit and a complete seal, it may only need to be inserted about one knuckle deep. If neither of these adjustments help, get in touch with our Flexperts for personalized advice!

What size Flex Cup is right for me?

Flex Cup comes in two sizes: Size 1 (formerly Slim Fit) and Size 2 (formerly Full Fit). If you're a first-time cup user or have a light to medium flow, we recommend Size 1. Size 1 has a 22mL capacity, which is about the same amount as two super tampons. If your flow is on the heavier side, or if you’ve given birth vaginally more than once, we recommend Size 2. Size 2 has a 30 mL capacity, which is about the same amount as three super tampons. Keep in mind that many users with a heavy flow still find that Size 1 works great—they may just need to empty and reinsert their cup a little more often.

How should I clean my Flex Cup?

We recommend cleaning your cup twice per day (or every 12 hours) during your period. To clean, first unthread the pull-tab. Wash your hands, then rinse off your Flex Cup in warm water. Use a mild soap—we recommend Flex Foaming Cup Wash—and give your cup a nice massage inside and out for about 20 seconds. Rinse, shake off excess water, and allow your cup to air-dry before re-threading the pull-tab and returning it to its pouch for storage. Otherwise, simply re-thread and re-insert! You may also want to deep clean your Flex Cup periodically. To do so, unthread the pull-tab, rinse the cup, and boil for 10 minutes in an open pot with plenty of water. Do not leave the boiling pot unattended. Use tongs to ensure the cup does not touch the bottom of the pot. If you burn your cup while boiling, your cup should be replaced.

What’s your Perfect Fit Guarantee?

No two vaginas are exactly the same—and that’s why we understand that you might not be able to guess your ideal period cup size on the first try! If your Flex Cup just isn’t working for you, reach out to our Flexperts. We’ll work with you to help you find the perfect fit, whether that means shipping you a different cup size or suggesting alternative fold or insertion techniques. With any new period product, there’s a learning curve. We're here to help you get through it.

Flex Disc


Still have Qs? Reach out to our Flexperts via phone, chat or text, and a real human will get back to you.