Waterproof Material: Made of Eco-friendly and scentless TPU, prevents skin from irritation; Soft and lightweight,Very comfortable to wear; Greater durability,LABORATORY TESTED! Sweat resistant and dry-fast, A must have band, especially for daily workout No Worry about falling off and Snags clothing: The replacement sport band with Metal buckle and fastener Ring features a stable and reliable performance to keep the band secure.and the smooth edge don't catch on anything Various colors: More than 20 special and pretty colors available for your Fitbit Charge 3, Add a new look to your favorite tracker, Personalize your tracker from work to workouts. Try on it for an outstanding look! Fit Perfect: No matter what type of wrist you are, from the thick wrist to the tiny one, it dose fit well and look nice, Small for 5.5 - 7.1 (14 cm-18cm) wrist, Large for 7.1 -8.7 (18cm-22cm) wrist 100% SATISFACTION: Friendly and responsibility backing.Any suggestion will be highly appreciated. We will always stand by you all the time. Available 24/ 7.