$ The app is only available on iOS

A brand new running shirt for men is in the works. Stay tuned!

Size Chart

The shirt must fit snugly against the body to ensure accurate readings. Selecting the right size is key to maximizing your OM experience.

How to Measure Yourself

Measure Your Shirt Size
OMshirt Size Chart
Inches Centimeters
S 35.5 - 37.5 90 - 96
M 37.5 - 39.5 96 - 101
L 39.5 - 41.5 101 - 106
XL 41.5 - 44 106 - 112

Find my fit video

Did you know? Studies reveal that nearly 70% of women aren’t wearing the right size bra. Selecting the right size is critical for your comfort, long-term breast health, performance, and signal quality. Watch our sizing video now and follow our guidelines to assess your assets.


starter kit
Bra Box Cable


Embedded heart rate and breathing sensors
Moisture-wicking quick dry fabric
Compression fit adapts to your body

OM's patent-pending technology embedded in the fabric of the OMshirt captures your deep and accurate body signals. By using leading sports science, the OMrun app helps coach you to achieve greater progress, increase endurance, reduce unnecessary fatigue and the risk of injury.

  • Sensors embedded in the band of the OMshirt capture full heart rate signature and breathing
  • Movement is captured by an accelerometer located in the OMbox
  • The detachable OMbox clips on to the shirt using 5 secure connectors and centralizes your body's data
  • Once you pair your OMbox with the OMrun app, the box streams your real-time data via Bluetooth to your iPhone
  • Only OMrun uses heart rate and breathing to calculate your personal Ventilatory and Anaerobic Thresholds which differ from person to person
  • OMrun then guides you to run within your own Smart Zones so you can run based on your own body's performance
  • OMrun's run recap and progress tracking provide you with a detailed report of your run, including information on basic metrics such as pace, distance, calories burned, and even more advanced metrics such as cadence, stride length, and breathing rhythm.

Grab your OMshirt, lace up your kicks, and let OM connect you to a lifetime of mindful running.

At OMsignal we pride ourselves on using only the finest cuts of fabric and the most advanced biosensor technology. Our smart shirts are created for busy people with active lives, so we made caring for them a cinch.

Follow our care instructions to​ ​make sure​ your OMshirt stays in top shape and continues to capture your most accurate heart rate and breathing signals, as well as its pristine appearance and comfort.

  • Quick care guide

    Remove the OM box before washing. Machine wash in cold water using gentle cycle with liquid detergent. Lay flat to dry. Do not wash inside out, use fabric softener, wring or hang to dry, bleach, iron, or dry clean.

  • Fabric​

    70% Polyester | 21% Nylon | 9% Spandex
    Exclusive of trimming

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The OMbra

For the woman in your life

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