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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.

Learn more about your hormone health
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Healthy Period Guide

What is Hormonal Acne

What are 'Normal' Progesterone Levels

BBT & Your Health

Gut Health & Hormones

Latest Hormonal Health Articles

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Basal Body Temperature - What Can It Tell You About Your Health?Taking our basal body temperature (BBT) daily is a great way to track ovulation, but it can also give you insight into your health and hormones. To get the full insight into your hormones and health,
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How To Check Your Cervix & Why You ShouldWhat Is The Cervix? The cervix is the bottom third of the uterus. It is the opening between the uterus and vagina. The cervix is an opening of the uterus into the vaginal canal (cervical os), through
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Charting for Health: Recognizing Happy & Healthy HormonesCharting can be an extremely useful tool on your journey to improving your health. Even if you are not looking to conceive or use it as a form of contraception, charts can give us a lot of insight in
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What a Low Basal Body Temp Can Tell You About Your HealthLow basal body temperature can signal issues with hormones or thyroid function. By tracking it consistently, you can spot signs of thyroid dysfunction, anovulation, or low progesterone early.

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Science-backed wearable BBT tracking for women who want real fertility insights.

Science-backed wearable BBT tracking for women who want real fertility insights.


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Placeholder disclaimer — not medical advice. Individual results may vary.