Bands compatible for Fitbit Versa 3 / Versa 4 / Sense/Sense 2, NOTE: Fitbit device NOT included The Fitbit versa bands are made from custom high-performance Soft Silicone, durable, strong waterproof, elastic, lightweight with greater flexibility and narrower width and surprisingly soft. Safe for human skin and no irritation. Small size for 5.5" - 7.1" wrist, Large Size for 7.1" -8.9" wrist. Size can be adjustable with buckle Various Colors can dress up your FitbitVersa 3 / Versa 4 / Sense/Sense 2 SmartWatch, and personalize your Fitbit Versa Watch to fit your mood and outfit in daily life You can contact us, if there is any question with our product. We will do our best to let you have an happy shopping experience.