The Fitbit Flex Wireless Activity Sleep Wristband in Blue is a sleek and stylish activity tracker designed by the popular brand Fitbit. This model is perfect for tracking your daily activities, specifically geared towards running and jogging. With a comfortable size range of S and L, this wristband is ideal for both small and larger wrists, and is compatible with iOS operating systems. Stay on top of your fitness game with the Fitbit Flex's advanced technology and vibrant blue color.