Review on Polar Pro Flex Strap by Gabriel Day

So I bought this to ensure the accuracy of the PolarH10. Although the Polar H10 is the best chest HRM I've used in the last 25 years, you do need to wash the straps every 5 hours of use. I highly recommend washing them in cold water in the wash, this always helps prevent HRM readings from getting out of hand or just getting stuck at the same readings for a long period of time. So order extra chest straps and change them. I live in Phoenix, Arizona and use my H10 about two hours a day (running, workshop laps) and so far turning 3 chest straps has provided accurate and consistent readings.