Lwsengme Silicone Strap Compatible with Fitbit Alta/Fitbit HR Wrist Replacement Band Smart Watch Fitness Strap Accessory Replacement Soft and Smooth Silicone Watch Band for Fitbit Alta/Alta HR Silicone material: soft and smooth, comfortable materials for daily and nightly wear Fits for wrist size : Large(6.7 - 8.1" ), Small(5.5 - 6.7") Watch Band with Clasp and Fastener Only. The Fitbit Alta/Fitbit Alta HR Tracker is not included.