Fitbit Charge 3 Accessory Sport Band. A replaceable sports band for the Fitbit Charge 3 with a durable, silicone construction that is wipe-clean and suitable for even the most intense workouts. The band comes with a secure aluminium clasp Sizing. Small: Fits wrists 140mm – 180mmLarge: Fits wrists 180mm – 220mmFeatures. Only compatible with the Fitbit Charge 3Flexible and durable silicone constructionAluminium buckleWater resistantWipe-cleanBuy Fitbit Accessories from Chain Reaction Cycles, the World’s Largest Online Bike Store.