COROS Heart Rate Monitor Sport and traction-enhancing spike plate

and traction-enhancing spike plate

helping you focus on your performance rather than your footwear

delivering a sock-like fit that adapts to your foot for superior comfort and breathability

Heel-to-toe drop: 4mm

The Ja Fly 4’s standout feature is its newly designed hexagonal plate

COROS Heart Rate Monitor Sport and traction-enhancing spike platePrecise Data. Total Comfort. Compatible with any Bluetooth heart rate enabled device, the COROS Heart Rate Monitor delivers over 38 hours of continuous accurate heart rate monitoring to track your workouts in distraction free comfort. Sleek and Snug Simpler to wear than a chest strap, our soft fabric band lays flat around your arm and locks in place with its textured surface. The low profile design prevents snagging on clothes or gym equipment,