BTdog Buckle Bracelet for Fitbit Zip - Fitbit Zip Wristband Five colors to choose- Bracelet off problem has been resolved Silicone material made, durable, skin-friendly and comfortable fit day and night One size fits most wrists size(165mm-230mm/6.50inch- 9.06inch) Perfect fit for your Fitbit ZIP activity tracker and comfortable wearing experience Colorful variety of color choices, there is always a right for you Please note that the step count sensitivity of the tracker might be altered when worn on wrist depending on tightness. however, the trend of your daily activity will not be affected.