Compatibility and sizing This hard PC protective case with builtin tempered glass screen protector is compatible with Garmin Forerunner 255S and Forerunner 255S Music. Not compatible with Garmin Forerunner 255 or Forerunner 255 Music. Please check the version on the back of the watch before and choose the correct size watch case. Note: The smart watch is not included. material and protection Bumper case constructed from lightweight, durable hard PC material with an HD clear tempered glass screen protector. It covers the watch screen and curved edges to provide comprehensive protection against accidental drops, bumps and scratches while maintaining a distinctive look. touch sensitivity The tempered glass film is ultrathin and 99% transparent to preserve original touch sensitivity. For results, remove the protective film on the watch face before installation; leaving it on can make the touch screen less responsive. Easy installation and use Precise cutouts offer easy access to all controls, buttons and sensors. Snapon design enables simple installation. No need to remove the strap to install the case, and you won't need to remove the cover when charging. Moisture and maintenance notes The screen protector does not absorb moisture. If you swim or exercise, consider removing the case to avoid affecting touch sensitivity. If water mist forms between the watch screen and screen protector, remove the case, dry both with a cloth or wipe, then reinstall the watch case. Color and personalization Available in multiple colors to your smartwatch and match your mood, outfit, or occasion. Ideal gift A practical gift choice for occasions such as Mother's Day, Father's Day, Birthday, Anniversary, Valentine's Day, Christmas, Thanksgiving Day, and more.