Polar H9 Heart Rate Monitor ( H9 HRM ) Size:M-XXL: 65-107 cm Light Transmission: 12 %

Light Transmission: 12 %

impact resistant blend of composites and polymer

Featuring three vented lens options and adjustable temples

Its antagonist action on adenosine during extended exhaustive exercise has demonstrated its effect on increasing alertness and cognitive function while decreasing fatigue

and it’s finished with an external eyewear pocket and Oakley Ellipse logo branding

Polar H9 Heart Rate Monitor ( H9 HRM ) Size:M-XXL: 65-107 cm Light Transmission: 12 %When you're looking for a reliable high quality heart rate chest strap, Polar H9 fulfills all your needs and more. Bluetooth and ANT+ technologies open up endless connection possibilities to any app or device you want to use. Accurate ECG heart rate tracking with up to 400 hours battery life. Bluetooth, ANT+, and 5kHz connectivity with 3rd party compatibility. Ergonomic, washable soft strap for maximum comfort. Electrical Heart Rate (ECG) Up to 400h