Flex is sold as a complete package in slate, black, pink, lime, or violet. All Flex packages come with both a small and a large wristband. These wristbands are both adjustable, so you can find the perfect fit for your wrist.
The small wristband will fit a wrist between 5.5 - 6.9 inches (or 140 - 176 mm). The large wristband will fit a wrist between 6.3 - 8.2 inches (or 161-209 mm). Both wristbands are .06 inches (or 13.99 mm) wide.
You can purchase additional teal, tangerine, and navy Flex wristbands in 3 packs. All accessory packs come with one clasp. You can also purchase individual wristbands in black, slate, teal, tangerine, pink, or navy. All Flex bands are available in a small or large size. These bands are available for purchase from the Fitbit.com store.