Polar Equine RC3 GPS Wristband Size : 9  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Wristband Size : 9  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Records your horse's heart rate, speed, distance Integrated GPS for accurate speed and distance measurement Includes RC3 GPS training computer, H3 heart rate sensor electrode base set, soft strap for the owner Plan, analyze and share your training sessions with the polarpersonaltrainer.com web service Includes a separate soft strap for the owner so that they, too, can use RC3 GPS in their own workout