Our FLEX Cup is also designed for comfortable, hassle-free periods. Plus, the patented ReleaseRing™ breaks the seal, so you can remove it in one smooth motion.

cup is easy to use


Wash your hands and the FLEX Cup for 20 seconds.

Press the sides of the cup together and then fold it in half again forming a tight “U” shape;

OR place a finger on the top rim of the cup and press it down into the center making the top smaller for insertion.


The FLEX cup folds for easy insertion, and then warms and forms to your body, creating a seal. Get in a comfortable position, relax your vaginal muscles, insert the FLEX Cup into your vagina, sliding it up and back toward your tailbone (not straight up).


Make sure the cup has opened completely by inserting a finger into your vagina and gently pressing on the side of the vaginal wall. You should feel no pleats or indentations. Creating space around it allows the cup to fully open.


Go and live your life as you normally would! You can swim, exercise, and sleep wearing FLEX Cup. It collects up to three super tampons worth of fluid for up to 12 hours.


Simply pull the ReleaseRing™ to break the seal and remove. The ReleaseRing™ pulls the top of the cup in to break the seal and help prevent spillage during removal. Before using or reusing, remove the ReleaseRing™ and thoroughly wash the cup for 20 seconds with warm water.

Flexpert icon

No question is TMI.

Reach out to our FLEXperts to get all of your questions answered.


Questions & Answers
1. How does a menstrual cup work?

A menstrual cup sits in the vaginal canal to collect menses, rather than absorbing it. It’s reusable, so one cup replaces your current products for the heaviest to the lightest days of your flow. Since it doesn’t absorb fluid, it leaves your natural lubrication in place, making it much more comfortable to wear. It can be worn for up to 12 hours, is hypoallergenic and does not affect the natural pH of your vagina.

The cup is folded to insert, and it opens up inside of you. It creates a seal with the vaginal walls to prevent leaks.

2. What is the difference between FLEX Cup and other cups?

With menstrual cups, a seal is created where the vaginal walls meet the cup wall. Once this seal is created, if you were to tug on the cup, you would experience suction.

3. How does it not leak?

The FLEX Cup prevents leaks in two ways. First, the cup itself creates a seal with the vaginal walls, which helps hold it in place and funnels everything into the cup.

4. Can you feel the loop when it’s in?

Our ReleaseRing is soft and pliable, so it moves with your body, rather than poking against it. You may feel the ReleaseRing right when the cup is inserted, but as it warms to your body temperature and conforms to your natural shape, you shouldn’t notice it.

5. How do I know which size is right for me?

We recommend that most first time cup users start with our Slim Fit cup. It will be easier to have it open fully once inserted.

7. What is the refund/return policy?

Thanks for reaching out! During our pre-order phase, you can cancel for a full refund at any time prior to shipping. Since the product is worn internally, we cannot accept returns or offer refunds once the product has shipped.

8. I have mobility challenges, will this cup work for me?

The FLEX Cup was designed by a woman with a disability to make cups easier to use, and we think it can expand access to use for many more people that have found conventional cups too challenging.

9. What is the difference between the FLEX Disc and the FLEX Cup?

Menstrual discs sit above the vaginal canal in the widest part of the vagina, called the vaginal fornix. Cups sit in the canal, similar to where a tampon sits.

10. Where can I learn more about the disc?

Find out more about the FLEX menstrual disc at www.flexfits.com

11. Have another question?

Our trained Flexperts are here to help. Contact us at hello@flexfits.com

  • Your period
  • Your lifestyle
  • Your concerns

Typically, how many days is your period?

How heavy is your flow on your heaviest days?

When did your last period start?

How many weeks do you typically have between periods?

What period product do you use most frequently?

How disruptive can your period be to your life?

What bothers you most about having your period?

What is the one thing you wish you could change about your period?

  • < 2 Days
  • 3 Days
  • 4 Days
  • 5 Days
  • 6 Days
  • 7 Days
  • > 8 Days
LIGHT (1-2 tampons/day)
MEDIUM (3-4 tampons/day)
HEAVY (4-5 tampons/day)
  • < 2 Weeks
  • 3 Weeks
  • 4 Weeks
  • 5 Weeks
  • 6 Weeks
  • 7 Weeks
  • > 8 Weeks
Period Panties
Can’t get out of bed
Can’t do certain activities
I mostly feel uncomfortable
Just like any other day
I’m constantly running to the bathroom
I can’t sleep through the night
My work out routine is thrown off
I can’t have sex
I feel uncomfortable
Less cramping
Less odor
Fewer leaks
No risk of TSS
Less waste
If you’re not sure, choose MEDIUM.

All done!

What email would you like your results sent to?

Here is our pick for you!
plan type
Light plan $6.50
4 Discs per cycle per period
8 Discs every 2 months
Light Flow Starter Kit
Includes 8 discs + our Getting Started Guide

We will automatically ship 8 discs for $13 every two months starting on . We’ll remind you before we process the next order. You can pause or cancel anytime, online.

plan type
Medium plan $12
8 Discs per cycle per period
16 Discs every 2 months
Medium Flow Starter Kit
Includes 8 discs + our Getting Started Guide

We will automatically ship 16 discs for $24 every one month starting on . We’ll remind you before we process the next order. You can pause or cancel anytime, online.

plan type
Heavy plan $14
Discs per cycle per period
24 Discs every 2 months
Heavy Flow Starter Kit
Includes 12 discs + our Getting Started Guide

We will automatically ship 24 discs for $28 every one month starting on . We’ll remind you before we process the next order. You can pause or cancel anytime, online.

Try FLEX with some liners at first.

Sometimes you just feel better with a little backup. FLEX plus liners would be a great combination for you while you transition to FLEX to help guard against leaks until you get the hang of positioning FLEX.

Not ready for membership? Try just one FLEX.