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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

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What makes temperature a biomarker for tracking fertility?

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What can I do if I don’t have any cervical mucus, or only very small amounts?

First, make sure you’re checking properly! Also, check your diet and make sure you’re getting enough water, as well as maintaining optimum vitamin levels. Check out this article for more tips.

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What do I need to track cervical mucus?

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What is cervical mucus?

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