Griffin Technology Ribbon Wristband for Fitbit, Garmin, Misfit and Jawbone Fitness Trackers - Redesigned to Improve Durability Materials: Stretch nylon and spandex Perfect fit on wrists up to 8.27" (21 cm) in circumference; just re-tie the knot Silicone-lined Pocket for Fitbit One, Misfit Shine + Flash, Jawbone UP Move, Garmin Vivofit and Vivofit 2 and other fitness trackers measuring up to 20 mm wide X 48 mm long X 10 mm thick 2 pack of Ribbon Wristbands