COROS HEART RATE

The gold-tier choice for heart rate monitoring, designed for extreme comfort and engineered for those who demand accurate training data. UNMATCHED COMFORT Ultra-soft fabric lays flat against your arm and locks into place with a textured surface that won’t budge during your 20-mile Sunday long run, or tempo laps around the track. JACQUARD BAND Instead of a printed pattern, the "Fearless" Jacquard features an intricate weave that provides deeper texture and a more secure hold. The high-tenacity nylon locks in color and keeps its elasticity for years to come. ACCURATE, ALL THE TIME The low-profile design is held firmly on your arm to prevent movement, snags, and external light that can cause heart rate data to be inaccurate. BATTERY FOR WEEKS 38 hours of active tracking and recharges in less than two hours. INSTANT CONNECTION No buttons, no menus. Built-in wear detection connects your heart rate monitor to your watch the moment you put it on. WHY THE ARM? Optical heart rate sensors work by using light to measure blood flow in capillaries beneath the skin. The top of your wrist is a convenient place for a watch, but is a challenging location for even the best sensors. Wearing on the upper arm offers our optical sensor an optimal amount of blood flow to gather heart rate data with accuracy equivalent to that of a traditional chest strap.