Amazon.com: Extender Band for Compatible with Fitbit Flex/2 Fitbit Alta HR Fitbit Luxe Fitbit Inspire 3 or Garmin Vivosmart 4 Watch Band, Band Extender for Larger Wrist or Ankle Wear (Black) : Electronics
WoCase FlexBand Small Wristbands for Fitbit Flex Activity and Sleep Trackers (3-Pack) Black/Pink/Turquoise F003 - Best Buy