SPORT ID - WRISTBAND FEATURES Highly reflective - utilizes 3M Scotchlite® silver reflective material (essential for jogging low-light conditions. ID card is kept securely and discreetly within the runner ID wristband. Can be used as a watch strap or with certain types of heart rate monitors (for use with watches and HRM that utilize strap pins of 0.75 inch width*) Easily updated - spare ID card included. 100% waterproof - OK to use in the swimming pool and ocean. Comfortable and discreet. Unisex sport design.