Are you worried about having your new or old Apple watch destroyed? Then a protective glass to the clock enough something for you, the protective glass allows you to put a glass over the glass on your apple watch, to protect it, so if you scratch your watch, you can just take it cheap protective glass by again and put a new one on, the glass is made to break if you drop your Apple watch watch, that means it is the protective glass that breaks and not your Apple watch, the more energy it takes by breaking the less energy there is left to destroy the watch on the other side.

The glass here is 0.2mm thick so it doesn't weigh anything and you can also without the problem use the touch screen on your watch, it's actually so thin, light and small that you don't even notice it's sitting on your Apple watch. It doesn't do anything about the tocuh on your Apple watch, it doesn't do anything about waterproofness and it doesn't do anything about antennas, speakers, microphones, etc. The protective glass fits all Apple watches with 38mm or 40mm watch size.