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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.

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What Is Progesterone?

By Gemma Rigby

Progesterone is a crucial hormone in maintaining a healthy menstrual cycle and supporting the early stages of pregnancy. 

During the luteal phase of the menstrual cycle (the time from ovulation to your next period), progesterone levels rise to thicken the uterine lining, creating a receptive environment for a fertilized egg to implant and establish a pregnancy. In addition, progesterone also supports the growth of blood vessels in the endometrium, ensuring a sufficient supply of nutrients to the implanted embryo.

Women experiencing low progesterone may encounter irregular menstrual cycles and difficulties in early pregnancy. 

Progesterone is also essential to your health, even if you are not trying to conceive. If you would like to learn more about this hormone, explore our in-depth guide: Progesterone Explained: What It Is, What It Does, & Why It’s Vital for Your Cycle.

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