Soft and flexible material: Made of silicone, which is soft and flexible and feels comfortable to the skin. Perfect fit: A perfectly designed fit for the Polar M400 / M430 GPS Sports Watch.Perfect fit: A perfectly designed fit for the Polar M400 / M430 GPS Sports Watch.&lt lt; User-Friendly Installation: Easy Installation - Tools Included. Water Resistant and Perfect for Sports Activities: Vary Your Favorite Sports Watch by changing your wristbandIt's simple and all tools are included. The bracelet is durable and water and temperature resistant and the many holes allow the skin to breathe. Specifications:COR: pretoDimensions: 142mm + 95mm (incl. buckle), fits 175-235 mm wrists Package includes:1 x bracelet compatible with Polar M400 / M430 Training Watch3 x Tools Tip: If it is difficult to attach the bracelet to your Polar watch, make sure that the old bracelet has come loose completely and no small parts are left in the bracket itself on the watch.