MALLCROWN [Super Easy] Built-in Screen Protector Snap-On Case Hard Cover for Watch - 42 mm Sturdy TPU snap-on Watch case adds advanced protection for corners, side and screen Sturdy and stylish TPU looks great and provides long-lasting protection for Watch Access to all the controls, buttons and features including heartbeat monitor. Using this product at gym or sports activities may cause the moisture (from perspiration) to be trapped between this product and the watch screen. This is due to the nature of the product as it does not stick to the screen.