Compatible Models: This elastic nylon strap is designed for Fitbit Charge 3, Fitbit Charge 4, Fitbit Charge Special Edition. Premium Nylon Material: Our stretchy charge 4 strap is made of a soft and comfortable elastic nylon material, this material isn't itchy, it is durable breathable and lightweight, easy to clean, suitable for all-day wear Adjustable Size Fit Most: Dirrelo soft fabric charge 3 strap has stainless steel loop buckle, you can adjust the lenth as your need, suitable for wrist size 5"-9.5", fit for most women men and girls Flexible Design: Works for daily Exercise. During sport, that elastic band would keep your watch against your wrist for workout reading. It does not irritate the skin when sweating, and it doesn't get stinky after sweatingfits. comfortably around you wrist Stylish Pattern & Colour: We have a variety of colors and different fashion patterns to choose from, is a choice for various occasions(Dates, parties, birthday parties, shopping) that make your Fitbit watch look different