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Armband Size Guide

Upper arm circumference

How to Measure

  1. 1Wrap a flexible tape measure around your upper arm
  2. 2Measure at the fullest part (mid-bicep)
  3. 3Note in inches or centimeters

Size chart

Size Inches cm
Standard Armband 8.5″ – 15.5″ 21.5 – 39 cm
Extra-Long Armband 12.5″ – 18.5″ 31.5 – 47 cm
Both armbands fit most body types.
Additional bra extenders can be purchased at any store if larger sizing is required.

Fertility Q&A

Pregnancy - Week 7

PREGNANCY

Pregnancy - Week 7

For your baby: Your baby's little features – eyes, nose, mouth, and ears – are starting to look more defined. The digestive system begins to develop: Your baby's stomach and esophagus are forming. ...

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basal body temperature

What am I looking for in my chart to confirm ovulation?

To confirm ovulation you are looking for two key things, at a basic level:  A sustained temperature increase. A change in your cervical mucus patterns. A sustained temperature increase:  Your...

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Fertility symptoms

When should you test for pregnancy?

While waiting to test for pregnancy, it's natural to feel a mix of emotions: excitement, anxiety, hope, and impatience. If you are concerned about testing, we’re here to help you understand when yo...

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Fertility symptoms

Why is temperature important?

Your resting temperature (Basal Body Temperature (BBT)) is affected by the hormones present in your body. As your hormones change throughout your menstrual cycle, so does your temperature.   After...

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Fertility Awareness

What fertility awareness methods are available?

There are plenty of fertility awareness methods (FAMs) out there. We recommend sympto-thermal methods (tracking symptoms and temperature) because of their high efficacy and structured protocol arou...

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PREGNANCY

Pregnancy - Week 30

Third-trimester symptoms may be ramping up a bit. More symptoms you may experience include constipation, haemorrhoids, UTIs, shortness of breath (as your uterus may start to press on your diaphrag...

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PREGNANCY

Pregnancy - Week 29

At week 29 of pregnancy, your baby is about the size of a butternut squash. By week 30, they are the size of a cabbage. Your baby is developing more reflexes. For example, they’ve started coughing....

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PREGNANCY

Pregnancy - Week 28

Congratulations -You’ve reached the third trimester! If your pregnancy symptoms decrease during the second trimester, be prepared that you’ll likely start having some more symptoms around this time...

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PREGNANCY

Pregnancy - Week 25

At 24-27 weeks, your baby is about the size of a cauliflower and weighs 1.5-2 lbs (700-1000 g). With all that size and weight, you will likely feel more frequent movement from your baby! Their move...

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PREGNANCY

Pregnancy - Week 23

At 23 weeks, your baby is about the size of a mango. They will grow to the size of a cantaloupe by the end of week 24. Your baby’s bones have developed enough functional bone marrow inside of them...

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