The Silicone Magnetic Traction Strap is made from high-performance liquid silicone rubber. It has a seamless connection to your Apple Watch and is also water and sweat proof. The Silicone Traction Strap makes use of a magnet system with a concealed closure for an easy and secure fit. The magnet system allows the strap to fit almost all wrists. The light weight and ultra-thin design offer ultimate comfort while the silicone rubber makes the strap durable, yet soft on your wrist.