Polar s3 stride sensor wind
Going beyond speed and distance to provide insight into the running stride itself the s3 stride sensor is a durable light weight module that measures just 55 x 39 x 14mm it can be mounted securely and unobtrusively to training shoe laces or placed inside the specially designed mid sole cavity in the adidas fusion running shoe the s3 stride sensor is activated automatically by the rs800cx wrist unit at the beginning of a training session and transmits speed distance and cadence data to the rs