baaletc extender band for fitbit flex/ 2 & fitbit alta fitness tracker wristbands - designed for larger size wrists or ankle wear, 14mm (width) x 115mm (length), black - Walmart.com
Exact screen size of the Fitbit Charge 3? - Fitbit Community
Best Buy: WITHit Universal size band for Fitbit Flex 2 Activity Trackers Plum 48343BBR