I-SMILE 3D Edition Replacement Wristband With Secure Clasps for Fitbit Alta Only(No tracker, Replacement Bands Only) Replacement wristband with secure watchband-style closure to keep your Fitbit alta on your wrist. Made of high quality TPE + TPU Rubber. Comfortable, durable and waterproof. The Fitbit accessory is a one size fits most wrists, Designed to fit most wrists (size: 5.5 inch - 8.9 inch). The Fitbit accessory band is specifically designed for the Fitbit Alta. No Tracker or other parts! For Fitbit Alta Band only!(Not For Fitbit flex, blaze, Force or other models(Note: Fitbit Alta Fitness Activity Tracker is not included)