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
Amazon.com: Fitbit Flex Bands
Fitbit Flex Band - Etsy
Fitbit Flex 2: Remme, Armbånd, Skærmbeskyttelse og Tilbehør.