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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.

What is the fertile window?

By Gemma Rigby

The fertile window is the time in a woman's menstrual cycle when she is most likely to get pregnant. When you're tracking your menstrual cycle, no matter your intentions, the fertile window is one of the most important parts of the cycle to identify each cycle. 


There are key body signs that help you identify this time during your cycle. To learn more read our article: Key Markers to Identify the Fertile Window or watch our brief video: Identifying the fertile window

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