FLEX ® Menstrual Cup (Originally the Keela Cup) – Full Review

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Where to get it?

Note: We're just reviewers of the Flex Cup, we don't sell it. However, you can get the best deals by shopping on the list above.

Flex Cup Sizes and Models

The Flex Cup is a menstrual cup that is manufactured in USA. It is made of Silicon and comes in 2 different sizes/models:

Note: Similar cup design/model can be found under the following name(s): Keela Cup
Flex Cup
Slim Fit
43 mm
74 mm
46 mm
28 mm
20 ml
25 ml
3 /5
3.5 /5
3.5 /5
Flex Cup
Full Fit
46 mm
82 mm
54 mm
28 mm
30 ml
35 ml
2.5 /5
3 /5
3 /5
Found any errors in our measurements? Let us know!

Description Videos and User Reviews

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The Flex Cup was originally the Keela Cup that launched on Kickstarter. The patented ‘pull string’ stem was designed to make removing this cup “as easy as a tampon”. 

The Flex Cup is available in two different sizes and offered in the color black. The original pink that was shown on the Keela Cup campaign was a prototype, while the backers received a dark blue cup.

 

Choosing the Right Model

Slim Fit Flex Cup (Small):

What’s included:

  • 1 Slim Fit Flex Cup
  • 1 Storage Pouch
  • 1 User Guide

Can be purchased with or without 2 Flex Disc Samples

 

Who is it meant for?

  • Those with a light to medium flow
  • First-time menstrual cup users

 

Full Fit Flex Cup (Large):

What’s included:

  • 1 Full Fit Flex Cup
  • 1 Storage Pouch
  • 1 User Guide

Can be purchased with or without 2 Flex Disc Samples

Who is it meant for?

  • Those with a heavier flow

 

Special Features:

Capacity

The Slim Fit Flex Cup is the smaller of the two sizes on offer. This size holds 20 ml to the air holes, and 25 ml to the top of the rim. This is about the average capacity for a small-sized cup, or two super absorbency tampons.

The Full Fit Flex Cup is the larger of the two sizes on offer. This size holds 30 ml to the air holes and 35 ml to the top of the rim. This is about the average capacity for a large-sized cup or three super absorbency tampons.

The company suggests the Slim Fit if you’re unsure of which size to purchase. 

These cups are not offered in a two-set.

 

Stem Design

    • The patented ‘pull string’ stem is attached at the rim, threaded through a hole at the base of the cup and is intended to break the suction by collapsing the rim. 
    • The stem can be semi-customizable by moving the stem up or down.
    • A ring for easy handling has been added to the end of the stem.
    • Because of the functionality of the stem, it cannot be trimmed. 

Rim

The secondary rim is a wide thickening of silicone that eases the transition from the body of the cup to the upper rim. The upper rim is a medium-sized band that is at the mouth of the cup.  

Cup Shape

The body of this cup is short and bell-shaped, which is great for those with a low cervix.

Grip Rings

This cup has no grip rings, either at the base or on the stem.

Material

The Flex Cup is made of slightly grippy silicone, and is only available in an opaque black.

Firmness

The body and rim of the Flex Cup is a medium firmness. However, the base of the cup has a solid and thick piece of silicone, where the ring stem is threaded through.

Air Holes

There are four, medium-sized, air holes a few millimeters below the upper rim. These are molded straight through and should be easy to clean.

Seams

There is a visible seam on both the inside and outside of the upper rim.

Markings

Although there are measuring lines and numbers – 3.5 ml & 5 ml for the Slim Fit and 7.5 ml & 15 ml for the Full Fit, they are not easily visible. This is because the cup is only available in opaque black and the ‘pull string’ stem is in the center.

 

Personal Experience

The Flex Cup (Keela Cup) is a unique and innovative design. However, I feel that it could have been better executed. Since the stem is positioned in the center of the inside of the cup, I had a lot of trouble getting this cup situated comfortably. I never felt like it created a good seal, and it leaked constantly.  Because there was no seal created, I didn’t need to use the stem as intended. However, it caused pain when I did try. I’m guessing that the movement brushed against my cervix.

These cups are on the shorter side, and although most short cups tend to ride up and sit higher for me, these didn’t. I could feel them move and slide periodically. When this happened, the hard center of the base, where the stem is threaded through, could be felt occasionally when I shifted in my seat. Although this cup didn’t work for me, it doesn’t mean that it won’t for you.  It just shows that one cup does NOT fit all.

 

Where to buy

We’re just reviewers of the Flex Cup, we don’t sell it. However, you can get the best deals on Flex Cups by shopping from the links in the top of this page.

6 Total Score

Overall Score
6
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