Sizes in mm are those of the belt without tension with the min and max setting normal voltage (beyond I think the elastic must quickly deteriorate). With this maximum setting, it no tension measuring about 65 cm. On the Polar site, the indication corresponds to 518-703 mm S-XS. Apparently lightweight locking system, which in any case is forgotten once in place. Immediate detection without humidification. A must to wear. My previous Polar belts sometimes occasioned small lesions on the skin at the transmitter. The design of it makes this possible drawback. That hostile users (in some cases one can understand) Made in China to be reassured. Polar develops, designs, and develops Finland. In case of weakness of a material or a component, they react. Thus for the first bracelet of the series RS800, rubber too hard, which broke quickly. Quick reaction and development of a new identical appearance bracelet, more flexible and strong. Sustainability check so for that belt ...
