If you purchased a wrong size band by careless or just feels the band fit too tight, Baaletc extender band will be a good accessory for your consideration. It's very easy to extend your wristbands from small to large even X-large size. Because of size extension, if you like, you can aslo wear the fitbit around your ankle. When your riding a bike, the fitbit may not record steps or record "low steps" on your wrist, however, if you can wear it around your ankle, then no problem with it.
The items compatible with:
Fitbit Flex 2 HR
(NOTICE: the package not include fitbit tracker or wristband)