Soft, durable, breathable silicone sports wristband makes it easy to go from work to the gym and everywhere in between. - Sporty and stylish that keeps you comfortable all day long – whether you're at the gym, in the pool or on the go. - Made of soft, stain-resistant silicone with large perforations that make it airy and very comfortable to wear. - The aluminum buckle keeps the bracelet in place even during tough workouts. - Water-resistant and can be worn in the shower and can withstand both swimming and sweat. - Original Fitbit accessories have been designed to fit Fitbit products and have been tested for comfort and durability. This bracelet is in size Large, which fits you with a wrist circumference of 17-21 cm.