RHYTHM+™ heart rate monitor is a direct chest strap replacement and easily attaches to your forearm for full wireless communication with your Apex device.
This heart rate monitor armband has been hailed as the best heart rate monitor available today. Its a revolutionary exercise and fitness tool that accurately monitors heart rate allowing you to maximize your workouts.
The APEX vest is made from a tight-fit elastane in order to produce the most accurate data. If you are between sizes we recommend that you purchase the smaller of the two.