I run between 7 and 9 hours a week with my Garmin 305. Recently, the belt original livery is set to return overestimated values (especially early in the race when the sweating is not yet sufficiently present). After 5 years, I thought, this is normal, it is time to change it. So I've opted not for the original model but this belt Version "PREMIUM". Unfortunately no better! Still the same problem and moistening the electrodes course! So I've returned the product and bought the original model HRM (cheaper too!) And no problems. Morality, PREMIUM HRM is not permitted! Opt for Lancian model! I also welcome the dAmazon my benefit that comes every 2 products in just 2 days and my bad refunded the day of my return application. I havent really no interest in taking my car to get in store! This really appreciable as quality service! Congratulations!