Security: The Silicon Strap Has Lugs On Both Sides・ Locking Onto The Watch Precisely And Securely. It Is Easy To Install / RemoveApplication: Perfectly Fit for Apple Watch 42MM Series 2/1 Sport Edition M/L Size・ Suited for 6.3-8.3 Inch Wrist (160 - 210MM)Durable Material: Durable And Soft Material Across Your Wrist To Feels Comfortable with High-Quality Texture