• support@fourthfrontier.com
  • Clothing differences:
    Hi all, I’ve found that when I wear a dry-fit style top (the material that moist running singlets and t shirts are made of) next to my skin and frontier X I get much higher heart rate notifications that don’t relate to the effort I’m putting in and how I feel.
    This morning my reading was 165 (I wasn’t working that hard)…Read More

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