Brighter color inside the band gives you an extra pop of color, Distinctive hexagonal hole design provides breathability and comfort, Aluminum double buckle matches the band so it works with any Ionic watch case and provides extra security for any occasion, Do not use hand soap, body soap, dish soap, hand sanitizer, cleaning wipes, household cleaners, or other similar cleaning products to clean the band or device, as they are difficult to remove and can get trapped under the band and irritate your skin, Tested, approved, and endorsed by Fitbit ambassadors such as cycling legend Jens Voigt, marathon runner Dean Karnazes, and pro runners Sarah and Ryan Hall, Water-resistant band is ready for rain, sweat, and swimming, Watch sold separately, Minimum and maximum circumference ranges from 140 - 170mm