Amazon.com : 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 : Sports & Outdoors
Fitbit Flex 2 Bands 2 Pack Replacement Wristband Accessories Classic TPU Material Sport Strap for 2016 Fitbit Flex 2 Fitness tracker(Large) - Walmart.com