【Compatible Models】Compatible with Fitbit Ace 3 Band. (Note: please check your Watch model before buy it. And no smart watch included).Size: 8.9*11.2cm,Fits wrist circumference: 5.5-8.7 inches. 【Comfortable Material】Silicone material.Providing you maximum comfort and breathability, makes it a perfect decoration for your bands from sports to work. These sport straps are lightweight, waterproof, sweat resistant and durable. Very soft and comfortable to wear. 【Ingenious Design】Adjusting hole position，easy to install and adjustable, holds your smartwatch band securely in place, no worry fall off. 【Waterproof】The strap can be waterproof, and it is not afraid of rainwater wet straps on rainy days. 【Easy Installation】Installation is very simple and easy to operate. Just install the movement on the strap. Style: Classic