Material: Grade silicone Color: white black, orange gray, olive green black, black pink, black red, black gray, black rose red, black lime, black teal, red-grey, gray teal, coal black, light pink teal, midnight blue Grey, purple lime Process: The surface of this product is made of medical grade silica gel, which is waterproof, sweatproof, comfortable and soft. The strap adopts thick design, comfortable to wear, easy to use, high-quality choice. The material has no harm to human skin, is environmentally safe and non-allergenic. Adapt to original Fitbit versa3, fitbit sense smart watch Specifications: Made of environmental silicone material, non-toxic and odorless. Made of high-quality ,environmental and healthy. Comfortable to wear. Softness is moderate, wear very comfortable. Compression molding, sturdy and durable. The size can be adjusted according to the circumstance of individual wrist. Package Included: 1*Watchband